Chimpanzees spend a lot of time grooming injuries on themselves and others. In fact, we rely heavily on observation of their behavior towards one another to monitor their health. For example, a chimpanzee may develop a small abscess from a bite or scratch during a fight. Depending on the location of the injury, the caregivers may not notice it at first. But the chimpanzees sure do, and this will often alert us to its presence. And while we tend to be a bit overly cautious and provide oral antibiotics, the chimpanzees do a pretty good job of grooming and draining injuries to promote healing on their own. This makes sense, of course, because free-living chimpanzees often suffer injuries and do not rely on humans for treatment. But it is fascinating to watch. Missy seems to be the most adept at using tools (in this case a piece of grape vine) to groom herself.
tool use
Tool use
Chimpanzees are famous for their ability to use tools, but some individuals are more skilled than others. We know that human talent is a combination of genetics, early life experience, and practice, and the same is true with chimpanzees, I believe.
Jamie loves using tools. She could spend all day working on a project. I don’t think she’s as interested in the end result as she is in the process. Sometimes, when we are serving food, we accidentally drop a few pieces on the floor outside the enclosure. Jamie will spend the rest of the mealtime working to get those pieces, even though her caregivers are still giving out food.
Burrito, on the other hand, is just not a tool user. He has very limited patience, and he doesn’t seem to get that same flash of insight that spurs chimpanzees like Jamie to go fetch an appropriate tool. This doesn’t necessarily mean he is less intelligent. Most of the time, begging humans for help works just fine. But it does give you an idea why Burrito is not the alpha that he would like to be – Jamie is always one step ahead of him!
Missy and her raisin board
We included raisin boards in this morning’s enrichment, and Missy demonstrated a new technique for fishing the raisins out (at least one that I haven’t seen before). Rather than trying to pry the raisins out or poke them out the other side, she would insert the chopstick and push it all the way through, like she was sewing with a big needle. It seemed to work well, except for when her tool would get stuck, in which case she would just break it off and start over with a smaller stick.
Dinner
Chimps are adept tool users, but you can’t get everything with a spoon.
By the way, this week the chimps are enjoying the first lettuce harvest from Negra’s garden!
Grooming with a tool, Negra in a blanket
The other day Missy was grooming a small scrape on her back with a piece of bark. Chimps love to groom injuries, so if no one else was going to help her, Missy was going to find a way to do it herself.
For Negra, it’s never too warm for a blanket. I think she just feels more secure when she’s wrapped up in something.
Grooming with tools
Jamie likes using tools so much she invents reasons to use them. Here Jamie is trying to groom Diana’s broken fingernail with a plastic wrench: