foraging

Encouraging Natural Behaviors in Captive Parrots

My last blog post concerned risk factors for feather damaging behavior, specifically lack of both liberty and control. The bigger consideration, of course, within this conversation about why parrots would damage the very things they need for survival, is quality of life.

In that last blog, I included a quote from Lauren A. Leotti and her co-authors: “In the absence of other stressors, however, the removal of choice, in and of itself, can be very stressful. It has been found that the restriction of behaviors, particularly behaviors that are highly valued by a species, contributes to behavioral and physiological manifestations of stress. It seems that the aversive effects of captivity may depend upon the extent to which behavioral choices have been reduced relative to what could be performed in the natural environment.” (Leotti, 2010)

Simply put, if captive parrots are unable to perform natural behaviors, the effects of captivity are going to result in serious behavioral and physical problems, which is exactly what we are seeing. Problems with biting, screaming, fear, and feather damaging behavior are all around us, as are growing numbers of parrots dying from atherosclerosis.

A New Paradigm

I’ve given this issue – the allowance of natural behaviors – a great deal more thought since I published that last blog post. While I did include in that post some strategies for supporting natural behaviors, this will be a deeper dive into that topic. I may repeat myself just a little, but we can’t hear this stuff too many times, right?

I suggest this model, the encouragement of natural behaviors, as the new paradigm for the way in which we care for our parrots from this point onward. In the past, our parrot-keeping efforts have been shaped by other concepts and models. Let’s take a moment to examine those in order to understand what may still be shaping our thinking as we attempt to move forward

Older Models for Parrot-Keeping

Dominance and Control

One of the most historically destructive models for the parrot-human bond has concerned that of dominance. In 1992, the following appeared in a popular magazine in an article about cage dominance: “To have a well-behaved parrot, owners must establish themselves as the dominant partner in the pair or flock bond…. As the bird establishes dominance over its cage, it becomes dominant everywhere.” (Blanchard, 1992)

In 1996, this message about the need for the human to be dominant was in the process of being softened and was now called Nurturing Dominance. “By establishing a relationship of nurturing dominance by teaching and consistently using the four basic commands, you can successfully demote your parrot from its perceived position as head of the flock.” (The four commands were: “Up,” “Down,” “No,” and “Okay.”) (Wilson, 1996)

In 1999, these “principles” of dominance and control were formalized in book form, with yet another name change to Nurturing Guidance. An entire page was given over to the concept of height dominance.

As it was explained: “People who have not established Nurturing Guidance will have trouble with height dominance, but they will most likely also have trouble with cage aggression, excessive screaming, biting, and other behavioral problems. I find that when people are having behavioral problems with their parrots, establishing non-threatening height dominance is the only way owners need to work with their birds.”

In other words, you won’t have behavior problems if you keep the bird down low and establish your own dominance. (If you need a really great counter argument to the myth of height dominance, read trainer Steve Martin’s article Understanding Parrot Behavior, Naturally.)

It is a sure sign that a behavioral “principle” has no validity if you need to keep morphing the concept and the name to make it more palatable to your readers. Moreover, if there is a dominant member in a relationship then, by definition, there must be a submissive member. Is that really the best we can do for the birds we love – to make them submissive so that they will behave?

In reality, there is a natural science of behavior that has been studied for over a century and has produced a set of fundamental principles, now known as applied behavior analysis (ABA). ABA can both explain why behavior occurs and provide ethical methods for behavior change when this is desired.

Unfortunately, those concepts of dominance and control are like the film on the bottom of our parrot’s water dishes, pernicious, insidious, always in the process of establishing themselves yet again. In the past two weeks, I have talked to new clients who expressed concerns about their parrot being up too high. It is scary how persistent this concept remains in the minds of parrot owners.

Clipping Wings Keeps Parrots Safe

Wing clipping has been practiced with almost religious fervor for decades in this country. This concept has been so well embraced that it was not even questioned for years, despite the fact that we were depriving a living animal of moving around normally. In large part, this practice has been established and maintained as the right thing to do by those doing the clipping – veterinarians and groomers.

Unfortunately, in all cases I have found, those writing about the dangers of flight have never lived with a flighted parrot in their lives. While well-intentioned, they do not understand flight and the manner in which flight skills develop, nor what can be done to ensure safety for flighted parrots.

Further, in my experience as a veterinary technician, no owner ever came in and requested a wing trim so that her bird would be safe. Instead, these requests were made because the bird was getting “uppity” now that it could fly. “Uppity” translates into being uncompliant and/or beginning to bite

Thus, in reality, wing clipping has been used in large part as just another way to maintain control of our parrots – limit their ability to move around and keep them down low. In other words, take away their feelings of safety so that they are less likely to resist our “commands.”

Other Models

A myriad of other well-established concepts exist, of course. These persist because of their authority borrowed from the reality that “everyone does it.”

These practices include keeping parrots in cages for most of every day, keeping parrots indoors at all times, cuddling parrots, cramming cages into a small room to contain the mess and noise, purchasing dome-topped cages, feeding seed diets…and the list goes on. We can always find someone else who does exactly what we do in order to validate our own choices.

A New Paradigm

We have before us a new decade. Let’s allow it to inspire us to shed the old skin of outmoded and destructive ideas and adopt a new paradigm for parrot-keeping. Should we do so, I would propose that we include as the most important criteria:

The provision for every parrot of as many natural behaviors as possible in each living situation.
To embrace the science of behavior, specifically the strategies of (1) arranging the environment for success, (2) antecedent change, and (3) positive reinforcement, to live harmoniously and cooperatively with our birds.

For the remainder of this blog post, I will be focusing on the provision of natural behaviors for our parrots, for there is much still to explore in this area. I have already written several posts on the second criteria of behavior change strategies, and will no doubt continue to do so in the future.

For now, I will leave you with the thoughts of trainer Steve Martin: “When you give an animal a voice through its body language, and place that voice in higher regard than your own, you are on the right path to successful training.”

Natural Behaviors to Encourage

Natural behaviors for wild parrots have been described as flying, foraging, bathing, roosting, socializing, vocalizing and breeding. However, there are others we might explore from the perspective of the companion parrot’s status in our homes. Some of the latter may attain a greater level of importance, given the often narrow scope of decision-making granted to them.

Two things: (1) First, this is an initial attempt only to explore this topic and my hope is that we can all brainstorm together from this point onward, and (2) I could write a separate blog post about each of the sections below, but in the interests of reasonable length, I have elected an introduction of each idea in most cases. Where I have important details to offer, I have done so.

A word about rights before I continue: If parrots enjoy certain activities in the wild, then would we not be correct in describing these same things as birthrights?

Bathing Options

Showering is important as a form of exercise and enrichment; it also serves to encourage normal preening. Opportunities most commonly involve taking the parrot into the shower or misting with a spray bottle. Other options should be explored in the interests of introducing variety.

Some parrots love to leaf bathe. Try offering a bunch of Swiss chard or fresh branches soaking wet and tied to the side of the cage or placed in a shallow dish. Both small and large parrots enjoy this activity once they are used to it.

Some parrots prefer bathing outdoors in an aviary, either in the spray from a hose or when it’s raining. Perhaps a water feature could be installed in the aviary?

We also have some exciting new products available – the unique creations by John Langkamp.

John creates bathing stations in all sizes that allow birds to bathe at liberty – when they feel like it. He also produces platform perches in a myriad of designs, play stands from the simplest table-top perch to two story sands, and “balconies” for cages that have no play tops. All of his products support the parrot’s engagement in natural behaviors.

Drinking Water

Parrots relish in fresh water. Mine eagerly drink from a freshly filled water dish, even though a moment before it still contained unsullied water. It has always struck me as wrong to limit a parrot’s access to water to drops coming out of a bottle. Wouldn’t you find it frustrating to have to lick droplets one at a time in order to drink?

Aside from the ethical problem of restricting a parrot’s access to water to this degree, water bottles can be risky. When water stops flowing, it becomes stagnant. Stagnant water is a breeding ground for certain bacteria species, such as Pseudomonas. (WHO, 2003)

When you wash out a parrot’s water dish, you will notice a film on the bottom. This is called the biofilm and is a coating in which water-borne bacteria grow.(Univ. of Ill, 2018) To adequately clean the water dish, you need a scrub pad.

With a water bottle, the water remains in the bottle for a longer period, thus enabling this biofilm to develop often for days. Refilling the bottle with fresh water does nothing to clean off the biofilm. Other risks involve bottle malfunction, which has resulted in the loss of parrots from dehydration.

My suggestion is to ditch the water bottles and let your parrot have a dish of water. Cleaning it twice a day should be sufficient, even for the messiest of parrots. If it gets poop in it, move it to another place in the cage up higher.

This has become the new buzz-word in the world of parrot enrichment, for good reason. However, we can expand our thinking even further. Parrots who naturally forage on the ground should be provided with opportunities of this nature. Grass mats for birds like budgerigars, cockatiels, and kakarikis are often eagerly accepted after just a few days.

Another great option is to place papers over the grates in the bottom of cages. There are several advantages. The birds get to go down onto the papers to forage for what they have dropped. I don’t have to scrub the cage grates. Changing papers is easy because all I have to do is to pick up the top later of paper; no need to pull out that heavy tray except for once a week. Many imagine that this will just result in poop-covered feet. It’s not appropriate for all parrots, but try it! You’ll be surprised.

Foraging for natural plant materials can be provided in aviaries. Raised beds can offer millet, sunflowers and other edible flowers, greens and other vegetables to encourage a more natural foraging experience.

Fresh Air and Sunshine

There is no other single thing you can do to provide enrichment that will reap as many benefits as setting up an outdoor aviary. The benefits are now widely recognized. Parrots are exposed to those necessary UVB rays. They wear themselves out and come back into the house calm and relaxed at the end of the day. They have access to different enrichment and bathing opportunities.

If you need some ideas, ask to be a member of the Home Aviary Design group on Facebook. It’s a private group, but is generous in accepting new members. The group has good participation and provides information about everything from design, to wire type, to rodent control and more.

Height and Alternate Perches

Parrots feel safer when perching up high. This is a birthright and a great way to provide enrichment. They also need to move around. “In this respect, most parrots are neither sedentary nor migratory but mobile within a geographical area that provides for all of the bird’s needs, but not necessarily all at once in one locality.” (Parr, 1998)

This observation of wild parrots can inform our own choices when creating an environment. Both flighted and clipped parrots can be provided with (and taught to use) free standing play gyms, hanging perches and other adornments to the environment that support more natural movements.

Lorenzo, the Double Yellow-headed Amazon in the photo was just adopted into a new home; he eagerly took to the trapeze they had prepared for him before his arrival.

Liberty Flying

I have published six blog posts on indoor flight for companion parrots. I am a passionate advocate for the allowance of flight, while also recognizing that some older parrots will not be good candidates for this experience.

It is not ethical to remove an animal’s ability to move around at will. As behavior consultant Jim McKendry once said, “If a dog gets out of the yard and bites the postman, we don’t cut off his legs. Instead we build a better fence.”

We must work towards the day when anyone breeding parrots must provide for a full fledging experience and then send that baby home without a wing clip. From that point onward, the new owner must learn how to live safely and cooperatively with a flighted parrot. We must also educate our veterinarians regarding a better way of thinking.

Imagine, just for a moment what your relationship might be like with a parrot who trusted you this much:

Video Courtesy of Lee Stone

Others’ Feathers

You should never get a second parrot because of the assumption that it will make the first happier. But, if you want to get a second parrot, my heart will be happy at the news. Having always lived with multiple parrots, I see how each bird gains just from having other feathered creatures in the home.

This is true even if the two parrots never interact physically. No other companion animal moves the way a bird moves. No other animal vocalizes like a bird does. No other animal reacts like a bird does. Just having another set of feathers in the house is enriching on multiple levels for a companion parrot.

The Unobstructed View

What effect might it have for a parrot to live his entire life within four walls? Perhaps none. On the other hand, I’m acutely aware of my own reaction when I get outdoors. It’s not just the feel of the breeze or sunshine, or the smell of nearby plants, but the fact that I am not confined. Finally, there is no barrier between me and the natural world.

How might we erase those walls, other than to get the parrot outdoors into an aviary? A Wingdow perch is of great appeal to many birds.

Wood, Branches and Bark

We don’t really know fully how parrots interact with the natural plant materials in their environment when that activity occurs outside of foraging for food. We do have some clues, however.

Donald Brightsmith and other researchers who have taken samples from the crops of wild macaws still in the nest have identified a percentage of bark chunks in the crop. Chris Shank and I have observed her free-flighted cockatoo parents foraging outside the aviary for bark and then returning to feed it to their young.

My own parrots love to strip the bark off of fresh branches. We don’t understand the purpose of these behaviors. However, I suggest that providing fresh branches for perches and chewing enrichment may well be necessary for quality of life.

There has been much written about the dangers of bacteria and fungus on plants taken from the outdoors. However, these come under the heading of “imagined” dangers.

Advice for “disinfection” stems from washing with vinegar to baking them in the oven. I believe, based upon anecdotal evidence, that these measures are unnecessary. If you are worried about “germs,” give the branches a good blast with your hose to dislodge anything suspect.

Two such “vases” with pine 2 x 4s on either side as chewable perches.

A great way to bring fresh branches into the home for your parrots’ enjoyment is to first create a “vase” for them. Purchase PVC pipe that is 4 to 6 inches in diameter, then cut a length about four feet long. You can paint this green for aesthetic appeal. Put this into a large Christmas tree stand and tighten in place. When ready, shove the branches down into the top of the pipe and replace as needed.

If you choose actively growing branches with the bark intact, there is little danger. Simply stay away from branches where the wood looks old and the bark is falling off of it, for fungus could be growing under the bark in those cases. Just allow common sense to prevail.

If unsure of the safety of certain trees, you can refer to this website. If you are unable to identify a tree species, you can take a sample into a garden center for identification.

The Keys to Change

It is human nature for most of us to reject an idea when we first hear of it, especially if it means more cost, inconvenience, or work…as most of those above will.

However, do you remember my point in that last blog about how our own behavior harm us? If we fail to appreciate that many of our practices for keeping companion parrots either do not meet their needs, may harm them, or even meet the definition of unethical, yet we insist on maintaining our own positive self-image, discord results – internal and external.

Let’s begin by deciding to be a bit more open-minded to the ideas above. Remember that you don’t have to help anyone else see the light. You just have to help yourself to see the light.

You can choose to stay away from opinionated discussions on social media and instead do your own research to find information from reputable sources. Then, if you get to the point of being convinced that you can make some improvements, just brainstorm to see what might be possible. Things don’t have to be black and white. You can start small.

Resources:

Blanchard, Sally. “The Importance of Cage Dominance.” The Pet Bird Report. Sept/Oct 1992: 4-7.

Blanchard, Sally. The Companion Parrot Handbook. Alameda: PBIC, Inc., 1999.

Juniper, Tony and Parr, Mike. Parrots: A Guide to Parrots of the World. New Haven: Yale University Press. 1998.

Leotti, Lauren A., Iyengar, Sheena S., Ochsner, Kevin N. (2010) “Born to Choose: The Origine and Value of the Need for Control.” Trends in Cognitive Sciences. 14.10: 457-463. https://doi.org/10.1016/j.tics.2010.08.001

Luescher, A. ,ed. Manual of Parrot Behavior. Ames: Blackwell Publishing, 2006.

University of Illinois at Urbana-Champaign. 2018. “Model to show how bacteria grow in plumbing systems.” Science News. https://www.sciencedaily.com/releases/2018/03/180329190849.htm

Wilson, Liz. “Nurturing Dominance: What It Is and How and Why It Works.” The Pet Bird Report. October 1996: 32-35.

World Health Organization (WHO). 2003. Heterotrophic Plate Counts and Drinking-water Safety. Edited by J. Bartram, J. Cotruvo, M. Exner, C. Fricker, A. Glasmacher. Published by IWA Publishing, London, UK. ISBN: 1 84339 025 6. https://www.who.int/water_sanitation_health/water-quality/guidelines/HPC4.pdf?ua=1

Thank you for reading my blog. I am Pamela Clark, an IAABC Certified Parrot Behavior Consultant. My passion is helping people with their parrots. To access free resources, schedule a consultation, subscribe to my newsletter (a different publication from this blog, or purchase my webinars, please visit http://www.pamelaclarkonline.com.

The Education of Star Bare-eyed Cockatoo

By guest blogger and free flight expert Chris Shank

Like an eager elementary student, Star leans forward on the perch next to her mom waiting to touch the target stick that will earn her a treat. Star, a six-month-old Bare-eyed Cockatoo, is learning how to acquire treats from me by touching a target. She is a quick and enthusiastic learner.

Star is parent-raised. She lives with her mom and dad, Bebe and Flash, in a spacious outdoor aviary. My goal for Star is to have her become a trained free flying cockatoo like her parents. She is well on her way by utilizing every bit of the 40 ft. x 20 ft. confines of her aviary as she develops her flight skills and strength.

Time Line of Development

Let’s exam her progression from a youngster barely able to hold and crack a sunflower seed to the more masterful cockatoo that she is today. Before explaining the teaching goals I have offered Star, here’s a timeline of her development and accomplishments thus far:

Star hatched on May 26, 2019.
8 weeks of age: Star fledges, leaving the nest box for the first time.
9 weeks of age: Is becoming more comfortable with me near her aviary.
10 weeks of age: Holds and eats an Avicake; flight and foraging skills are improving.
11 weeks of age: Is becoming more comfortable with me in the aviary.
12 weeks of age: Still is fed by her parents, but eats more often on her own; flight skills are progressing to an adult level.
13 weeks of age: Comes down to the training perch on her own when I’m absent and eats from the attached bowl.
14 weeks of age: Comes to training perch and watches as I hand feed treats to Bebe on the perch.
21 weeks of age: Not eating from my hand yet, but eats willingly from a handheld bowl.
22 weeks of age: Takes treats and an almond from my hand; whimpers endearingly while waiting for the treat.
23 weeks of age: Targets and takes a treat!
24 weeks of age: Eats mostly on her own while occasionally begging and receiving food from her parents.

From the timeline, notice that the more Star becomes self-sufficient with her feeding ability, the more engaged she becomes with me on the training perch. She still shows caution and is anxious if I move too fast or do something out of the ordinary, but she recovers quickly. This little one is on her way to learning what people are all about.

Star’s Progress

A typical school day for Star consists of watching what her teachers – her parents – do. From them, she learns where to forage and what foods to eat. She practices her preening skills on each of them and learns cockatoo etiquette, as well as proper Bare-eyed vocalizations. Crucially, she learns how to be a successful and well-adjusted Bare-eyed Cockatoo.

At six months of age, Star exhibits significant mental and physical confidence. For example, when I put up new foraging enrichment, she immediately tries to puzzle out how to get the goodies. She either figures out solutions on her own or watches closely as Bebe or Flash tackle the problem. Learning from observing her parents is immensely helpful for Star, as it is for youngsters of all species. She is absorbing skills and behaviors from them that help her become a normal and mentally- balanced cockatoo.

The following is a striking example of acquiring a skill through observation. I made foraging wood blocks with holes drilled in them to hold hidden almond pieces. I strung the blocks together and hung them from a perch in the family’s aviary. The blocks could be accessed either by climbing down the string or sitting on the perch and pulling the string up.

Star flew to the foraging toy the minute I hung it. I watched as she climbed down the string of blocks and struggled while it twirled around as she was trying to get the almond from the wood. She quickly let go and flew off.

Next, Flash came over to the blocks and nonchalantly pulled the string up with his beak and foot as he sat on the perch. He could now hold the block of wood and quickly tear into it for the almond. The entire time Star watched him intently.

What I observed next solidified for me the importance of parental influence. After Flash left the string of blocks, Star started to pull it up, just as Flash had. Of course, she wasn’t as physically coordinated with this new skill, but she was successful nonetheless.

People Socialization

Over the last weeks, Star has made steady progress becoming more people-friendly or at least tolerant and I attribute her advancing people skills once again to her parents. Both cockatoos were parent-raised and socialized to people here at Cockatoo Downs. They’ve had extensive positive training encounters with a variety of people who visit here or come to our training workshops. All their training has been with positive reinforcement.

Not raised to be ‘snuggly’ cockatoos, Bebe and Flash exhibit natural Bare-eyed Cockatoo behaviors while maintaining a positive connection with people. They’ve learned that interacting with folks will bring them good things to eat and they rarely pass up a training session opportunity.

Soon after Star fledged, I invited people to come and engage with her parents in short training sessions of targeting. From afar, Star observed Flash and Bebe’s training sessions, which set good examples for Star to emulate in the future.

Star’s Training

It’s impossible to rush Star’s training as she will respond simply by flying away. Flighted birds make us better trainers because we learn quickly that taking micro steps toward our training goals is essential. If we push or ask for too much, our student will fly off with an “I’m-outta-here” retort.

The goal of Star targeting and taking a treat from my hand was accomplished in stages. First, she learned to eat from attached feed bowls on the training perches with her parents. This enabled her to understand that the training perch was a source of good things.

Step One: Star learns to come down and eat from bowls on the training perches.

Next she learned to stay on the perch while I was feeding her parents. She watched closely as her mom and dad took treats from my hand. When I offered my open hand chock full of sunflower seeds and pines nuts to Star, she responded with a big fat “No way!” and off she flew. It took several sessions for her to become desensitized to the scary hand.

Step Two: Star learns to stay on perch while I feed her parents from my hand.

I accomplished it by taking a step backwards and offering her a “safer” option which was to eat from a handheld bowl. That did the trick as she became comfortable with seeing my hand near her, but didn’t have to deal with the frightening (eek!) possibility of touching it.

Step Three: Star learns to eat from a bowl I hold in my hand.

Step Four: Star learns to take treats from my hands.

Soon Star was eating from my hand. She progressed rapidly to taking a treat calmly from my fingers to—ta da!—touching a target.

Step Five: Star learns to target!

Slow Going?

One could argue that, at six months of age, a hand raised cockatoo would be weaned, be super people -friendly, stepping up on the hand, learning recall, and other behaviors we expect in our companion parrots. I would counter that with, at what cost to the young parrot and her parents? Please read my previous blog post that compares hand-rearing vs. parent rearing and the impact of each on their offspring.

It makes me sad to think of the critically important education hand-raised parrots miss growing up without their parents. So much of what gives Star her success in life so far has been taught to her by Bebe and Flash. It’s because of hand raising’s short- and long- range detrimental effects on both parents and chicks that I have chosen to parent raise Star.

So what if it takes longer to socialize and train her? We have all the time in the world. It’s the journey I’m taking with Star and her parents and what I’m learning from them that makes this so worthwhile.

Chris Shank’s love of parrots and knowledge of animal training began several decades ago. Her professional experiences include a degree from the Exotic Animal Training and Management Program at Moorpark College in California, an internship at Busch Gardens’ parrot show, work as a dolphin trainer at Marriott’s Great America in Santa Clara and later in Hassloch, Germany.

Her love for cockatoos came after a relocation to the Philippines. Once back in the United States, she established her aviary Cockatoo Downs, where she has regularly offered training and education to parrot owners for many years now. She is an internationally-recognized expert in free flight.

What Needs to Be Said

What needs to be said is that no matter how hard we try to provide the right environment when hand raising parrots, we can never provide every essential thing chicks need to grow into well-adapted and well-adjusted psittacines.

I hand-raised cockatoos in the distant past and I now advocate for letting parrot parents do the job. I realize my advocacy is like telling a screaming parrot to be quiet, as this is usually ignored and the screaming continues.

However, I will press on to champion for the right of captive parrots to raise their own offspring. Watching Star, a fourteen-week-old Bare-eyed Cockatoo, flourish under her parents’ care underlines for me how important it is for young parrots to be educated by their parents.

Let’s look at some contrasts I’m finding between parent-raised and hand-raised cockatoos using fledgling Star and my own hand-raised birds as examples.

Foraging

Before cleaning the cockatoos’ aviaries the other day, I put up various browse for Star and her parents and the hand-raised cockatoos to forage upon. I was amazed at the length of foraging activity Star and her parents displayed. The full two hours I cleaned, they were actively engaged, ferreting through the offerings finding leaves, seed heads, or berries that suited their fancies.

Star forages on garden-grown millet spray.

In the “hand raised” aviary there was initial interest in the browse, but that ended quickly as the interest was instead focused on me by landing on my shoulder or by watching what I was doing from a perch. The only bird who kept at the job of foraging in the hand-raised flock was Ritzie, who was parent- raised.

This diligent foraging activity of the family certainly shouldn’t be unexpected or surprising; after all, we are all primed by our evolution to forage for food. Even though parrots and people are endowed with an inherent drive to search for food, we must learn to how to successfully do so. Having models to learn from is the easiest and most efficient way to develop and master foraging skills. In Star’s case, her teachers are her parents.

Star forages on rose hips with her parents.

And it’s just not parrots who learn from their parents, as the following example shows. Dr. Courchesne, a veterinarian, who teaches biology at Northern Essex Community College explains:

“Late August is high time for harassment [of people by gulls],” she said, “because the young have fledged and their adult parents take them to foraging spots, which include beaches and boardwalks, to find food and to teach them the ropes. The gulls, like the humans, bring their whole families. They’re being so pushy for food because they’re such committed parents,” she said.^{^[i]}

While people at the boardwalk have learned to forage for their food from snack bars (and are, no doubt, teaching their kids to do the same), gulls have learned how to forage on the food people carry away from the snack bars. Thankfully, Bebe and Flash are not teaching Star to swoop down and steal a sandwich from me, but they are certainly teaching her which foods are tasty and where to find them in the aviary.

Most hand-raised fledglings are at a disadvantage when it comes to foraging. They typically do not have an adult conspecific or even a parrot of another species to model foraging behavior; or, if they do, the adult parrot may not have learned all the fine skills of foraging or developed the motivation to search for food other than from a food bowl.

I found many common refrains on foraging and the companion parrot with a quick online search that reflected the following: Be persistent! Pet birds often require repeated encouragement until foraging becomes a way of life. In fact, many hand-raised bird will give up relatively easily when they cannot find food right away.

I personally have experienced the above statement with my own hand- raised birds. I was lax at enriching the fledglings’ environment with browse or toys many years ago and, as a result, those adult birds illustrate a lack of foraging interest today. Some of the flyers don’t bother to seek foraging opportunities even when out free flying.

The free flyers forage in the garden.

That said, the cockatoos are intelligent and inquisitive animals and over the years some have learned foraging behavior from interacting with foraging toys or from finding sunflowers and millet grown in the garden. Here, though, it must be said that they take a lot of their cues from watching the parent-raised flyers raid the garden.

Socialization

When one thinks of a socialized companion parrot, usually what comes to mind is a parrot who is nice to people; that is, she is a friendly, malleable bird who is not fearful of us or our environment. The parrot has been taught to behave in a manner that is acceptable in our human community and way of life. On the whole, hand-raising a parrot does accomplish those goals, if done with skill and compassion.

Socialization, the process of learning to behave in a way that is acceptable to society, does take place with the parent-raised parrot of course. However, it is a socialization of another sort, in that the parents are teaching their young to behave in ways that are acceptable to parrot society.

Unfortunately, many hand-raised parrots miss out on this opportunity. The effect of this missed education sometimes manifests in a parrot who is afraid of other psittacines, or shows no interest in parrots, or may not have a clue as to how to behave successfully with others.

In Learning and Behavior, Paul Chance states: “…organisms are especially likely to learn a particular kind of behavior at one point in their lives, these stages for optimum learning are referred to as critical periods.”^[ii] With that in mind, my goal, with her parents’ help, is to teach Star to be successful in both human and parrot society at this critical period in her development.

As always, it is engrossing watching Bebe and Flash teach young Star how to be a proper cockatoo. And they don’t always use positive reinforcement methods when teaching Star about correct cockatoo etiquette. For example, Bebe will quickly give Star a strong bop with her beak if Star muscles in on food Bebe doesn’t want to share.

Star is further taught about cockatoo conduct by the cockatoos who live in the next door aviary. Even though they do not physically interact with Star, no doubt she is learning much about cockatoo socialization from observing the behaviors the others exhibit. For instance, she has become quite comfortable munching beak to beak (separated by the aviary wire, of course) with her neighbors as they all take advantage of a picnic of browse that is offered them in the same locale.

On first look this may seem inconsequential, but indeed learning to be near other non-familial cockatoos provides important lessons. Not only is she learning that other cockatoos can exist together amiably, she may pick up a new tip or two by watching how they forage.

At this juncture in Star’s life she is learning how to behave in cockatoo society, but not yet in human society. At Star’s age, a hand-raised cockatoo would be far advanced in knowing how to succeed with people. My goal is to teach Star how to succeed in my community and, with the help of her parents, in her community. This education will give Star effective skills for navigating both worlds.

She’s already on her way by learning that people can offer her good things. She watches as her parents get goodies on their training perches from me as well as from people they do not know.

Star looks on as her parents accept treats from visitors.

I interact with her parents daily. She sees the calm behavior her parents exhibit when I’m with them and that is a valuable visual lesson for her. I’m excited by the progress she is making as she is getting physically closer to me each time I am in the aviary.

Star eats on the training perch quite near to Chris, following her parents’ example.

Star’s learning and behavior development and comparing that progression with the behaviors of my hand-raised cockatoos is a fascinating, stimulating, and humbling journey that I invite you, the reader, to continue to join me on as I discuss more observations and dichotomies in my next blog.

^[i] James Gorman, In Defense of Gulls, New York Times, 8/24/2019.

^[ii] Paul Chance, Learning and Behavior (Wadsworth, 2003) pg. 434.

Environmental Enrichment and Learning

A pair of wild cockatoos going to nest encompasses a lot of work. They must find a nest cavity, prepare it, defend it, and after a bit of romance, eggs are made and laid. They then take turns brooding the eggs, feeding and caring for the chicks, which all leads, hopefully, to the successful fledging of the babies.

I let my pair of Bare-eyed Cockatoos go to nest in May so the chicks could be trained for free flight. Mr. and Mrs. Flash and Bebe Bare-eyed Cockatoo accomplished all of the prerequisites with success.

Their chick, Star, fledged at 9 weeks of age. With relief, I thought the hard parts were over for the couple. But, I was wrong. From what I observed from the parents’ behavior, having a youngster out of the nest can be stressful for them—at least it seemed so for Bebe, the mom.

While Flash was handing out cigars at the chick’s successful emergence from the nest box, Bebe fretted over Star. The first few days she stayed close at Star’s side as if to reassure her about her new world. She persistently preened Star and touched her beak to keep her at ease. Star didn’t go exploring much and that seemed fine with Bebe.

Parenting and Contrary Behavior

Though Flash and Bebe appeared to me to be excellent parents, I noticed a behavior that I didn’t understand. It took the form of a power struggle before fledging over who was allowed access to the nest box to brood the eggs.

For example, if Bebe wanted to enter the box, sometimes Flash would chase her away, or vice versa. Once either of them claimed the box there was no more strife, meaning the “winner” was never made to relinquish the nest box once he or she was inside. It wasn’t a frequent occurrence, but it happened enough to catch my attention and cause concern.

Why would this behavior take place? This didn’t make sense. Do wild Bare-eyed Cockatoos do this in nature? To me it didn’t seem to be conducive to successful chick raising. Was this just a behavior imposed by captivity? I don’t have the answers.

One way I thought to modify or change this antagonistic behavior was to let one or both birds out to free fly when I saw the clashes happening. Since flying uses lots of energy, it did seem to help calm them down upon returning to the aviary after their fly-abouts.

Flash and Bebe Out for a Fly About

Typically, when they left the aviary giving each other the hairy eyeball, they almost immediately paired up and flew together in synchronicity, which helped them re-establish a compatible pair bond. However, with one especially hostile encounter in the aviary, I let them out to fly and they even argued while flying. That changed when they spotted a hawk in a nearby tree. They put their differences aside to band together to harass the hawk and all was well.

Star Talk

Let’s talk about baby Star. I admit that the morning Star made her appearance I was momentarily confused. I saw three birds instead of two sitting together on a perch. Did one of the neighbor cockatoos find a way into Bebe and Flash’s aviary? No, my slow witted brain figured out the third cockatoo was the baby!

After silently shouting for joy, I watched in amazement the little one taking in her new environment. I couldn’t imagine what she was thinking, after growing up looking at four walls and not much else. When I first saw her, Star had already flown to the front of the aviary. Bebe was sitting securely by her side and she was not letting Flash close to Star.

Star was adorable. Her feathers were perfect. Her tail had yet to reach full length so she appeared smaller than her parents. (As of this writing, her tail has reached full length and she looks almost to be the same size as her folks.) She didn’t do much exploring the first few days and seemed content to stay by her mom’s side.

Flight Skills

Gradually, Star started taking control of her new surroundings. When I observed Star’s first flights, it was like watching a butterfly. She was kind of wobbly and there was not much umph in her propeller. Her directional flying was suspect. She’d pick out a destination, but sometimes didn’t accomplished her goal. That didn’t deter her as she would gather her determination and try again.

Star Practices Flying and Landing on Perches that Move

Of course, with each new effort she was more frequently successful in landing where she wanted. Behavior is a function of its consequences and Star was showing me exactly how that worked. Successfully landing on her goal perch was positively reinforcing for her so, of course, she’d attempt it again all the while becoming more competent in her landing skills.

From ten days onward her flight mastery greatly improved. Her progress was impeded by aviary living, however, and I’m sure if she were in the wild, her flight development would proceed more rapidly. During this time, the parents were acutely conscious of her movements and one or both would follow her everywhere in the aviary.

Learning in Action

One of the fascinating things about watching Star grow is the marvel of seeing learning in action. We sometimes take for granted or don’t even think about how we and our fellow animal friends learn. Of course, we learn every single day; and, watching someone, in this case, Star, learn about what works and what doesn’t work is thrilling to me. And, boy, she has lots to assimilate.

Star needs to learn flight, of course, but also proper Bare-eyed Cockatoo vocalizations, fine motor skills, foraging, social skills, and much more. Because there are so many things that affect Star’s learning progress, I’ll be focusing on only one influence in this article. I’ll start off with the importance of environment enrichment and its effect on learning.

Environmental Enrichment

As described by the website Why Animals Do the Thing, “Environmental enrichment is the process of enhancing an animal’s environment to increase their physical activity, fulfill their psychological needs, and encourage engagement in species-typical behavior.” This is exactly what Star needs to develop into a competent, resilient, and confident adult.

To that end, I have equipped Star and her parents’ aviary with a wide variety of enrichment. Let’s take the availability to forage, for example. I allow different weeds and grasses to grow in the aviary. These serve as foraging opportunities for the cockatoos.

I also harvest and install a variety of plant matter such as mustard seed pods, blackberry stems with berries, hawthorn berry branches with berries, ash tree branches with seed pods, barnyard grass, millet spray, crab apple branches with apples, and anything else that might be of interest to the birds.

Bebe Teaches Perseverance to Star

All of these foraging opportunities are everyday occurrences for Star’s parents who take full advantage of them. But to Star they are important learning opportunities. The parents are skilled and eager foragers and Star follows their foraging behavior by learning how to manipulate and eat the offerings.

Star Forages Up High on Mustard Seed

It was touching to watch Star learn to forage. While mom easily snapped a small stem of browse off a mustard plant and held it steadily in her foot while opening the seed pod to eat the seeds, it wasn’t so easy for baby Star.

This Isn’t As Easy as It Looks!

It would take her a while to zero in on a piece of the plant, get it in her beak, and snap it off. Then she’d take several attempts to hold it with her foot to munch on. In the beginning, she’d sometimes drop the plant stem and have to start all over. That didn’t deter her, however. She kept at it and kept getting better.

Perching is another environmental enrichment that gives Star chances to learn and practice motor skills. I have furnished the aviary with boings, orbits, rope perches, 2×4 wood perches, and natural branch perches. There’s even a small live birch tree available to perch in. Each helps Star develop skills such as balancing, landing, playing, all while developing her strength and confidence.

Yet another environmental enrichment for Star is simply living outdoors in her aviary. Star learns all about the weather, the sun, the wind, the rain, the cold, the horse and donkey who walk by her aviary each day, her cockatoo neighbors and the cockatoos who free fly over her aviary, the vultures who soar above, the swallows swooping and swerving catching insects, the bats who come out in the evening to hunt those same insects, the bellowing of the cows at night, as well as the songs of the coyotes. These and many other wonders and surprises are available for Star to learn about while living outdoors.

I remember one instance when only a few days after fledging, we had a very strong late afternoon wind. Star had been sitting on the front perch of the aviary when the wind picked up. It got so strong that it made her wobble on the perch. She was very reluctant to fly to the back perch, which was out of the wind. Instead, with her mom by her side, she held on tight to the perch leaning into the wind and learning about balancing in the blustery air. Although it was a bit distressing to watch her seesaw about, I’m happy she had this important learning experience.

I found this quote while reading, Learning and Behavior, by Paul Chance: “Our environment exerts control over our behavior [by stimulus control or cues]. Paradoxically, that can increase control we have over our lives.” In other words, the more variety of learning options that stimulate Star to explore and learn what works and doesn’t work, the more control she has over which options with which to engage.

Providing Star with an enriched positive environment will build her behavioral repertoire that will aid her during difficulties or opposition. I look forward to watching her behavioral education expand her ability to function successfully in her new world and look forward to sharing that with you.

Latest News!

Ellie Bare-Eyed Cockatoo came to live with me over a month ago. In my last blog I described how we are learning about each other’s quirks, both good and bad.

I described how Ellie has the unfortunate alter ego that I call, The Flying Dragon Lady. The Flying Dragon Lady’s (FDL) job is to drive me from my home by flying at my head with her scary beak wide open, ready for the attack.

I told FDL that this behavior is not conducive to a friendly, safe home environment. She refused to listen. So I went about changing the environment to make it harder for FDL to function, which I explained in the last blog.

As Ellie’s and my time together continues, FDL has made minimum appearances, but she still exists. What is really cool is that I’ve worked everyday to have Ellie touch a target and get a pine nut for doing so. This is a miraculous training tool and I’ll give an example why.

FDL showed herself the other day. I took out the target and while FDL was sitting on her cage thinking about her next attack, I had her target the chop stick and then gave her a pine nut. Before my very eyes, FDL vanished and sweet, calm Ellie emerged. It truly was astounding. This episode shows the power of using a well-learned and consistently positively reinforced behavior to change an emotion. FDL is capable only of being harsh and discordant, so away she went allowing sweet Ellie to return.

Just for Fun!

I want Ellie to grow comfortable with the free flyers, so that she won’t be startled when they come to visit her aviary. So, I have been practicing her targeting in the aviary while another cockatoo remains outside.

The delivery of reinforcers to them both teaches them that good things happen when in the proximity of the other!

My Parrot Won’t Play With Toys!

This is a claim I hear often from parrot owners who are totally frustrated in their efforts to offer enrichment in the form of toys or foraging, only to see their birds ignoring it. Many simply give up, after spending what seems like endless amounts of time and money, having achieved no success at all.

And, after all… isn’t it okay if we have a bird who doesn’t play with toys if he seems happy enough? If he’s not displaying behavior problems and he’s healthy, why keep trying? Keeping parrots seems to be a lot of work at times. Many ask, “Do I really need to keep working on this too?”

I hate to disappoint you…but the answer is yes. You do need to keep working on this. Your parrot does need to interact with enrichment for the very best quality of life. If you want him to enjoy physical, emotional, and intellectual health, you’ve got to keep trying.

Parrots, like all creatures, evolved to act upon their environment in different ways. When they do, the environment gives them feedback. This feedback from the environment offers them the chance to learn. This learning process enriches their lives much of the time in different ways.

A parrot who doesn’t know how to keep himself busy is a lot more likely to develop behavior problems such as screaming or chewing off feathers. “Captive settings may limit the expression of normal behaviours and, as a consequence, abnormal behaviours may develop.” (Rodriguez-Lopez, 2016)

Your parrot can work on a foraging project for 30 minutes, finally accessing his treat. Or he can scream for 30 minutes until you finally react. The treat and your reaction are both “feedback” from the environment. Both types of feedback enrich his life because he acted on the environment in order to get a certain result.

His existence is enriched by your social attention when you react, even if you sound angry or use a swear word or two. It can be quite enjoyable for a bored parrot to figure out what he can do to get a reaction out of you. He is hard-wired to act upon his environment. He will do so independently of you and your desires.

I have always thought of a parrot’s day as similar to a “pie chart of activity.” In other words, they operate in our homes within an “activity budget.” I want my parrots’ activity budget to look something like this pie graph. Granted, the time spent in each activity likely would not be the same, but you get the idea.

If your parrot doesn’t fly or interact with wood or other enrichment, there’s a much greater chance that some of those pie wedges may read “screaming” or “biting” or “feather destruction.”

There is a second reason why we can’t give up on trying to get our parrots to interact with physical enrichment. Life in captivity is stressful for our companion parrots, no matter how good a job we do with them. “Captive animals are susceptible to chronic stress due to restricted space, lack of hiding places, presence of visitors, or the lack of resources that promote physical and mental stimuli. In birds, chronic stress can promote stereotypes, self-mutilation, feather picking, chewing on cage bars and walls, fearfulness and excessive aggression. Environmental enrichment (EE) becomes an important management tool to decrease chronic stress in captive animals.” (de Almeida, Palme, and Moreira 2018)

Thus, it is a real problem when a parrot doesn’t interact with enrichment or know how to forage. It’s enough of a problem that it deserves dissection. If we can come to a better understanding of the problem, we can both prevent it AND solve it.

The problem begins with our own expectations. Everyone talks about parrots “playing,” so we expect our parrots to play. This expectation is not a reasonable one, if applied to all parrots.

Baby parrots play. One of the happiest periods of my life was when I was breeding a small number of African Greys each year. There is nothing more fun that watching the development of baby parrots. They are learning machines. They are eager to investigate anything you give them. Like all baby animals, they are playful. That is their job – it’s how they learn about the world.

Once mature, however, most adult parrots don’t play. It’s not their nature to be playful. Granted, there are exceptions. Some individuals are more playful than others. Some species tend to be more playful than others – caiques, lorikeets, small macaws and some conures, to name a few. Some individuals within those species could play for hours with a simple object. If you need cheering up, check this video out.

However, if you expect an African Grey, one of the Poicephalus species, or an Eclectus to be playful, you could wait a very long time. Thus, the first problem is thinking there is something wrong with your parrot if he doesn’t play.

An adult parrot has a different job – to stay safe with the knowledge he’s learned to date. They are often suspicious, if not downright afraid, of new things. If you expect your adult parrot to immediately interact with a new toy or project, you may be sadly disappointed. It could very well take a week or longer before your bird decides that object is safe enough for exploration. So, that’s the second problem – expecting your parrot to interact with new enrichment items without a proper period of introduction.

If your older parrot was raised by a breeder who didn’t offer enrichment to the babies and then went into a first home or two where this need was also neglected, he may have temporarily lost that once-important desire to investigate, even once an item does become familiar. Both situations can lead to that diagnosis – My parrot doesn’t play with toys!

The third problem we create for ourselves with this issue has to do with perception. Dr. Susan Friedman has made enormous contributions to our understanding of behavior. In many of her articles, she discusses the problems that result when we label parrot behavior. For example, if I think of my parrot as aggressive, this leads me nowhere, in terms of arriving at a solution to that problem. However, if I look at the circumstances surrounding the bites, I see that there are some things I can change. Changing the right circumstances in an effective way does lead to a solution to the problem.

When you tell yourself …My parrot doesn’t play with toys!…it’s the same thing as imposing a label on your parrot. That statement in itself will prevent you from solving this problem because you will believe it. To move toward a solution, you must look at what the parrot does do and build from there. Every parrot interacts with some objects, even if you don’t think of them as toys.

A fourth obstacle to having a parrot who interacts with enrichment is the type of things manufactured and sold to parrot owners. Often these are targeted at you and your pocketbook, rather than your parrot’s preferences. Purchasing the wrong type of toys can lead to the same conclusion – My parrot doesn’t play with toys!

For one thing, the desires of a parrot and the desires of a parrot owner are not the same and toy manufacturers know this. A parrot wants to destroy a wood toy quickly and easily. He wants to act on his environment. A parrot owner wants to buy a toy that will last due to the expense. He wants to spend his money wisely.

How many of us have wasted our money on the toy to the right? Those alphabet blocks and round wooden beads are so hard that only the very largest of parrots can chew them up. Most parrots will simply give up after a short while. But, the important thing to the owner is that he didn’t spend $25.00 on a toy that only lasted a brief while.

The second problem is the power of advertising. We love parrots and we love photos of parrots. Therefore, as a selling tool the manufacturer or company will position a toy with a parrot suggesting interest in the parrot towards the toy. You’ve got to use your critical thinking skills to question the advertising before moving the item into your shopping cart. Look at the toy to the left. Suggested by the photo as appropriate for a cockatiel, this toy is totally unsatisfactory for a bird of that size…or any bird. Those coconuts are very hard and the holes are so small that getting anything out of them would be difficult.

Let the buyer beware.

So, what are you supposed to do if you have a bird doesn’t play with toys?

First, find a starting place. Most parrots interact with something. If you have a parrot who loves to play with bottle caps (and doesn’t chew on them), hide bottle caps in a foraging toy so that it takes some work for him to get at them.

If your parrot loves to chew the back of your sofa, create toys made of fabric. Get a cotton gardening glove and stuff it with interesting items and food treats and hang this in the cage. Or find a pair of baby overalls at Goodwill and use zip ties to close up the legs. Then, stuff the pockets with foot toys and treats.

If your parrot loves paper and cardboard, but won’t chew wood, then give him foraging projects made from those materials. If your parrot only chews on smaller wood toys, but demolishes them too quickly, then create these with wood slices and beads on a stainless skewer sold for parrots.

Second, make sure that the perching you provide sets the bird up for success and makes it easy for him to interact with the item. I often see toys hung in the cage without any perch nearby. Put yourself in your parrot’s feathers. If he perches there, can he reach that toy comfortably?

Third, provide reinforcement. Once you have found an item with which your parrot interacts, keep a soft focus on his behavior. When you see him touch or chew the toy…or even just look at it…immediately tell him “Good!” and quickly offer a preferred food treat. Soon he will learn that messing around with things in his cage earns him food!

Fourth, experiment. Gradually, add a wider variety of toys – stainless steel bells, paper, fabric, easy-to-chew wood, puzzle toys, etc. Through this process, you can discover a lot about your bird. Don’t pre-judge his interests and preferences. Perhaps you’ve always just given him wood toys, only to find that he’s insane for bells. Many small macaws for example, enjoy sitting underneath bells. One caveat: most parrots prefer toys made of natural materials; my advice would be to leave those acrylic toys at the bird store, unless they offer a foraging challenge.

One small study found that parrots interacted with their staple diet of pellets for longer periods if they were provided with “over-sized” pellets. (Rozek, Danner, Stucky, Millam, 2010) These required longer periods of time for consumption, given the additional challenges of manipulation. If your parrot consumes one size of pellet, perhaps providing much larger pellets in or out of foraging toys could be an important type of enrichment.

The most difficult challenge can be teaching an older parrot to forage who never learned the skill in the first place. Baby parrots are naturally curious, but they have to be provided with the raw materials to develop this into the skill of exploration. Older parrots can still learn this, however, and it is important that they do. “Enrichment is more successful it if is aimed at soliciting species-specific behaviours such as foraging.” (Coulton, Waran, Young, 1997)

Teaching a parrot to forage requires starting with very basic challenges and then making them incrementally more difficult in small steps. Many of you may have already seen this, either on my website or on Facebook, but I have completed a pamphlet of foraging challenges that are easily made at home from inexpensive materials. It demonstrates how to start out simple and gradually add complexity. This is free to all of you for download: Parrot Enrichment Made Easy: Low Cost Tips and Tricks.

Lastly, there are some foraging toys sold on the market today that do help beginning foragers to learn the skill. My favorite is the Acrylic Foraging Kabob. It triggers interest because the parrot can see that it has something inside of it, but offers enough of a challenge in extracting the items. It can be very helpful in introducing vegetables. And, it includes a food skewer that is useful in making other toys.

A last word. Remember – always watch your parrot with any new toy to make sure he’s interacting with it safely. Most parrots will not ingest non-food items, but watch nonetheless, especially if you are giving your parrot a toy with cotton strings attached.

End Note: I attempt, whenever possible, to substantiate my anecdotal observations with scientific research. I have cited a number of studies at the end of this blog that help to support what I have said. However, there has been a bit of a bias among researchers to focus more on enrichment for captive primates and carnivores. The studies that have been performed for captive parrots are few and often have been done on very small populations. They may be suggestive, rather than definitive.

Thank you for reading my blog. I am Pamela Clark, an IAABC Certified Parrot Behavior Consultant and licensed veterinary technician. My passion is helping people with parrots. For more information and to access many free resources, please visit me at http://www.pamelaclarkonline.com. Until next time!

Please note: Credit for the featured photo goes to Saeed Lajami on Unsplash.com.

References:

Coulton, LE, NK Waran, and RJ Young. 1997. “Effects of Foraging Enrichment on the Behaviour of Parrots.” Animal Welfare 1997, 6: 357-363. https://www.researchgate.net/profile/Robert_Young15/publication/233642678_Effects_of_Foraging_Enrichment_on_The_Behaviour_of_Parrots/links/004635388f928d5693000000.pdf

De Almeida, Ana Claudia, Rupert Palm and Nei Moreira. 2018. “How Environmental Enrichment Affects Behavioral and Glucocorticoid Responses in Captive Blue-and-Yellow Macaws (Ara araruana).” Elsevior Applied Animal Behavior Science Journal 201: 125-135. https://doi.org/10.1016/j.applanim.2017.12.019

Meehan, CL, JP Garner, and JA Mench. 2004. “Environmental Enrichment and Development of Cage Stereotypy in Orange-winged Amazons (Amazona amazonica). Wiley Periodicals, Inc. Dev Psychogiol 44: 209-218. https://pdfs.semanticscholar.org/bbb2/a21684e23a62de973c1779e8d6a103f7463a.pdf

Rodriguez-Lopez, Rogelio. 2016. “Environmental Enrichment for Parrot Species: Are We Squawking Up the Wrong Tree?” Elsevior Applied Animal Behavior Science Journal 180: 1 – 10. https://doi.org/10.1016/j.applanim.2016.04.016

Rozek, Jessica, Lindsey Danner, Paul Stucky, and James Millam. 2010. “Over-sized pellets naturalize foraging time of captive Orange-winges Amazon parrots (Amazona amazonica).” Elsevior Applied Animal Behavior Science Journal 125: 80-87. https://doi.org/10.1016/j.applanim.2010.03.001