Chimpanzee Sanctuary Northwest

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Training with Gordo

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One of my favorite parts of this job, besides building and maintaining relationships with my chimpanzee friends, is getting to participate in our Positive Reinforcement Training Program. Positive Reinforcement Training (PRT) means we use rewards (food, praise, play, etc) to reinforce and encourage desirable behavior. We do this to provide the chimps and cattle with the ability to participate in their own care, and make necessary tasks (such as preparing for a sedation or even serving of meals) as stress free as possible for everyone involved.

Recently we were discussing the need for Gordo to have a routine physical exam to get a better understanding of his current heart health and health overall. This posed a bit of a daunting task as our goal before completing the exam is to have him comfortable with being separated from his group, and participating in training with a focus on injection training. At the time of the discussion, Gordo had only trained a handful of times and generally did not show interest in participating when we asked him to. Here comes the fun part…making a plan to achieve this goal, tweaking the plan as we encounter obstacles, and most importantly – making the whole experience positive and enjoyable for Gordo and strengthening our relationship along the way!

You may be wondering, why does he need to be comfortable being separated from his group? In order to safely sedate and then remove a sleeping Gordo for his exam, he needs to be alone. This is both for his safety so he is not vulnerable to others as he falls asleep, and for our safety as we then have to enter his room once he is asleep to take him to the clinic for his exam. Through PRT, we can work to make being separated from the group a positive experience (for example, being by himself means he gets a jackpot reward of several of his favorite things) which will help him feel less stressed as we prepare for his exam. Without training him for separation, it would likely cause much more stress for him when being separated as there would not be an existing positive experiences under these circumstances. We also have the goal to focus on injection training so that when the time comes, he will hopefully present his arm or leg for his injection to begin the sedation process. This is less stressful and easier to accomplish than having to use a small dart gun to administer the sedatives.

The first step was to write a shaping plan – a step by step guide for how we hoped to accomplish these goals. Jenna wrote a plan, and we were quick to get to work on it! Only one problem, Gordo was not as eager as we were to start the training. Most of his group is incredibly interested in training, so we had to have two trainers – one to occupy everyone else, and one to train with Gordo. We quickly altered our plan to train with him during meal time, when he often separates himself from the group naturally and comes up readily to receive his meal. We use a frisbee with hooks on the back of it to show him where we would like him to stay during the session (this is called a station marker), and he got the hang of this quickly! He comes up to his station marker, and to my surprise and excitement, he was very interested in training within just one training session!

Gordo stationing (in a box he pulled up to sit in, of course!)

We use both verbal and visual cues to communicate what we are asking of the chimps. For example, if I were to ask Gordo to present his left hand, I would hold up my right hand (mirror image) with my fingers pointed towards him and say “hand.” I would expect him to put his left hand up, sticking all of his fingers (except his thumb…that would be hard to accomplish since it is so small!) through the caging towards me. Gordo was quick to recognize that we were having a training session during the meal, and he started offering up several different behaviors he had learned during his time at Wildlife Waystation and seemed eager to participate. This may sound simple, but for a chimp who just a few weeks before was not interested in coming up to train, this was a big breakthrough and very exciting! As often is the case when working with chimps, we needed to be creative in order to find what worked best for Gordo. We are continuing to work with him on stationing (staying in one place) while doors are being operated, and have been focusing on his arms and legs during training sessions as these are ideal locations for injections. He is doing very well presenting both of his feet, his hands, and his right arm and leg so far! So long as he continues to do well, we will start progressing in his injection training (the next step is simply bringing a capped needle along to our sessions for him to observe), and asking him to move to different locations to station to be sure he understands that the same concept applies in a variety of situations.

Gordo presents his foot

Gordo touches his station marker

Gordo presents his leg and allows for a gentle touch with a chopstick!

PRT is such an amazing tool to have as caregivers. It helps us build stronger relationships of trust and cooperation with those in our care, and also allows them to actively participate in their own care. Through PRT you can get many important diagnostic values that may even prevent a need for sedation and can allow you to monitor existing conditions more regularly. It is incredibly rewarding to make progress in PRT with any trainee, but especially someone like Gordo who was not always interested or motivated to participate in PRT, and who this training can so greatly benefit him by decreasing his stress around a necessary procedure! Go Gordo, go!!!

Teamwork

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Bite wounds are probably the most common injuries we see in chimps. Our treatment protocols for these wounds tend to be fairly conservative: administer analgesics for pain, clean frequently with antiseptic spray, and monitor closely. There are a few reasons for this. First, chimps have a superhuman (literally) ability to heal. Wounds that would send me racing to the ER for stitches will close up on their own in chimps with little to no treatment in a matter of days or weeks, remaining uninfected and leaving no visible trace once healed. Second, because of the frequency of wounding in captive groups, there’s always a risk of antibiotic resistance if antibiotics are over prescribed. And third, many forms of diagnostics and treatment require the chimps to be anesthetized—something we avoid whenever practical out of concern for their overall safety and well being.

Once and a while, though, there are wounds that require a bit more than the typical conservative approach—like recently, when Rayne received a bite to her third digit (middle finger) that resulted in some swelling. When the swelling persisted even as the wound appeared to heal, Dr. Erin wanted to rule out an underlying fracture. Thankfully, our Positive Reinforcement Training (PRT) team was able to train Rayne to hold her hand in the x-ray box so that we could get some images without the need for anesthesia.

Here, Jenna asks Rayne to hold her hand flat in the box so we could get the first in a series of shots.

Jenna then withdraws her hand and Rayne holds hers still (while that other hand is trying to investigate the x-ray generator!).

The good news is that Rayne did not have a fractured digit. Interestingly, you can see an old healed fracture on her 2nd digit (index finger).

Though the swelling soon began to subside, PRT also made it possible to treat Rayne’s finger with a therapeutic laser to help encourage the healing process. For this, Rayne needs only to sit at her station marker and respond to Grace’s command to present the fingers of her left hand through the mesh. It was Rayne’s choice to pull up the orange ball and sit on it.

Sabrina is then able to program the laser, at Dr. Erin’s direction, and apply it to Rayne’s finger.

The only problem? Everyone wants a turn!

Positive reinforcement training requires a lot of staff time but these little opportunities to apply all that effort can really add up in the form of improved diagnostics, more effective therapies, and fewer trips to the clinic. Even if we learn that a chimp will require a more complex exam or treatment under anesthesia, we can often go in with a head start given the information we are able to obtain.

For her part, Rayne seems pretty happy to participate.

You want me to rotate my hand 90 degrees for a lateral view?

Here, you can laser my feet, too!

Just keep that juice coming.

 

What Makes Us Tick

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We’ve written a lot about that ways that Positive Reinforcement Training (PRT) can improve the lives of captive animals, including—or should I say especially?— chimpanzees. Chimps are so powerful and so strong-willed that often the only way to get them to reliably engage in certain behaviors, whether it’s allowing the stick of a needle to administer medication or leaving an enclosure so it can be cleaned, is to ensure that it is by their own choice.

One area where PRT is particularly useful is during meals. Some dominant chimps take a What’s mine is mine and what’s yours is also mine approach to food, leaving other chimps in their group hungry, anxious, or both. A technique known as cooperative feeding can encourage dominant chimps to allow their group mates to eat their meals in peace by rewarding tolerance for others eating nearby. The trick is not to forcefully assert our own sense of fairness but to show certain chimps that it can be worth their while to chill out a bit. Sure, you could steal someone else’s food, but if you allow everyone else to eat you’ll get something even better for a whole lot less effort.

We’ve been using this technique with Jamie lately, as she has been giving both Foxie and Annie a hard time during meals. It’s certainly not unheard of for Jamie to steal food to assert her dominance, but the recent uptick has had her group mates on edge and unwilling to even take certain foods. Why all of a sudden? It’s hard to say for sure, but it’s possible that Jody’s passing left some ambiguity within the hierarchy and Jamie may have been feeling the need to remind everyone that there will be no changes at the top. Subtle, she is not.

One of the keys to effective training is finding the right unconditioned reinforcer, which is the natural reward that often follows the click or whistle, telling the animal that behavior is worth doing again. In almost all of the training we do—that is, the training the occurs during formal sessions—that reinforcer is food. Sips of juice, pieces of chopped up fruit, and bits of primate chow are all effective, though each individual will be motivated according to their own preferences. For Jamie, that means a click! and a piece of preferred food or drink every time she watches Foxie or Annie receive something she might want to steal. And if she stays at her station throughout the entire meal, she may even get a special treat, such as a whole clementine, at the end.

But food is such an efficient reinforcer that we sometimes forget that it’s not the only one. For Jamie, flattering her ego may be an equal or even greater reward. That’s not to say that Jamie doesn’t appreciate the special treats, but the extra attention from her caregivers and special status at mealtimes may being doing some if not most of the work. Perhaps when you are recognized as the boss by the humans in front of all your group mates, there’s less need to constantly remind everyone.

We’re all motivated by a handful of basic desires – to be noticed, to be appreciated, to be respected. Figuring out what makes someone tick can go a long way toward influencing their behavior. Because in the end, Jamie isn’t as complicated as she would appear: all she needs is the unquestioning loyalty, unreserved admiration, and complete and thorough submission of all those around her, human and chimpanzee, at all times. That and a few extra pear slices and she’ll be happy to mind her own business at lunch.

Training Fun

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Getting chimpanzees to participate in their own medical care is incredibly important for their physical and psychological health. But some chimps, like Foxie, are reluctant to take part. After three decades in laboratories, who could blame her? But with patience, and lots of positive reinforcement, the chimps do learn to trust us. Sometimes, you just have to bend the rules and have a little fun.

Willy B spent some quality time in the courtyard today. I watched as he walked about eight feet across the grass to retrieve a cherry from the ground. He used a small plastic chair almost like a walker so that he had a grip on something familiar. Once he was safely back on the boardwalk, he pant-hooted and then climbed back up to the platform to relax. He even laid down in the shade out there for a while. He’s getting to the point where he only goes back inside for lunch…what a difference a month makes.

And guess who reached out to grab some cabbage from the boardwalk? This is how Willy B started – we’ll see if Mave follows the same course.

Cooperative Feeding

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Willy B is a thief.

Bear in mind, it’s a very minor blemish on his otherwise flawless character. And he’s certainly not the first chimpanzee in history to steal. But it is a problem.

At each meal, Willy B takes what is his and then helps himself to everyone else’s. You can get away with that when you are 175 pounds of muscle. But Honey B and Mave need to eat, too, and none of us need all that drama. While we could isolate Willy B in a separate room during meals, that could lead to pent up frustration and it would certainly be logistically challenging at times. This is where positive reinforcement training comes in.

For many years, we’ve used positive reinforcement training to encourage the chimps to cooperate with medical procedures. Those same techniques apply to husbandry challenges as well. The other day, Anthony built a moveable “target” just for Willy B. After being trained to orient towards and touch the target, Willy B is now learning to remain wherever the target is placed, a behavior known as stationing. Stationing allows us to create some distance between the chimps while they eat. At the same time, he’ll learn that he will be amply rewarded if he remains at his station the entire time and allows the girls to receive their food. Taken together, this is known as cooperative feeding. Mr. Dominant Chimp gets the special privileges he deserves and no one goes hungry. Everyone wins.

This is something I have come to love about working with chimpanzees. You can’t force them to do much of anything, so you are required to demonstrate a little patience and humility. I often visualize it as a choice between trying in vain to dam up a stream and slowly and methodically carving out a new path for the water to flow in a more favorable direction. One day I hope to put this lesson into practice in other areas of my life but let’s not get ahead of ourselves.

On a side note, there may be a reason why Willy B was so quick to learn to station. On the other side of the Frisbee there is a pattern with a reflective surface in which he can catch glimpses of his own beautiful face.

Now we may need to train him to look away from his own reflection long enough to eat.

 

Building trust

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Providing medical care to chimpanzees is always a challenge, but it can be particularly difficult when they have been subject to decades of invasive medical research procedures against their will.

Years ago, we participated in a study that considered whether chimpanzees might exhibit abnormal behaviors that cluster into syndromes similar to posttraumatic stress disorder and depression in humans (you can read it here). Negra was featured in the paper as a case vignette:

A chimpanzee named Negra was a 36-year-old female at the time of the study. Taken from the wild in Africa as an infant, she has remained in captivity since that time. She was used in invasive research, including hepatitis experiments, and for breeding. Each of her infants was removed from her at an early age. During the period in which she was used in research, she was kept in isolation for several years. Approximately 1 year prior to the study, she was transferred to Chimpanzee Sanctuary Northwest in Washington state, where she currently lives with six other chimpanzees.

Negra met alternative criteria for depression and PTSD. According to reports, she had persistent depressed hunched posture, and she was socially withdrawn. Negra slept excessively during the daytime, and she lacked interest in play, food, other individuals, and grooming. She also demonstrated poor attention to tasks. She was described as slow and sluggish, and at times, she appeared anxious. In response to an unexpected touch, she would “threat bark,” scream, or run away. Compared with other chimpanzees, she demonstrated less variability in her facial expressions. Caretakers reported that her face was expressionless, “like a ghost,” for at least a month after she arrived at the sanctuary. She seldom, if ever, exhibited a play face. She was tested for a thyroid disorder and assessed for other medical causes of her clinical presentation, but all laboratory tests were within normal limits. Based on later reports provided by her caretakers, some of her symptoms have improved since she has been living in the sanctuary. She has become more interested in other chimpanzees, including grooming, and the variability in her facial expressions has increased.

Negra’s anxious response to being touched was not just a sad reminder of her earlier trauma; it was a serious impediment to her care at the sanctuary. Chimpanzees routinely receive wounds from fights, they develop dental problems, they get heart disease and diabetes and many other illnesses, and these things often require medical intervention.

There’s always a way to force medical care on an uncooperative chimpanzee, and sadly that is what’s required from time to time. But that can be stressful and even dangerous. They deserve a chance to participate willingly. Giving them that choice, however, requires a lot of time and energy on the part of their caregivers.

For years, CSNW caregivers (first Debbie and now Anna) have been working with Negra to habituate her to basic medical evaluations and treatments as part of our positive reinforcement training program. These efforts have paid off many times over, most recently when Negra received a wound to her back during a fight. Negra let Anna spray the injury with antiseptic solution and she allowed Dr. Erin to follow that up with laser therapy. In cases where antibiotics may be needed, Negra will even let her caregivers swab the wound to culture the infection and determine the best course of treatment.

For some chimpanzees, this kind of cooperation is no big deal. But chimpanzees are individuals – they have unique life experiences and they cope with those experiences in different ways. Negra has never given her trust lightly. It had to be earned through years of persistent efforts on the part of her caregivers.

It has certainly been worth it.