Chimpanzee intelligence is well-known and a specific aspect of their intelligence that I find particularly fascinating is their awareness of self as separate from others, or ‘theory of mind’. A classic experiment used to test for theory of mind in animals is the mirror test whereby a mark is placed on the face or some other body part of an animals and then they are presented with a mirror. If the animal notices the mark and reaches towards their own face instead of the one in the mirror, this indicates that they are aware that the image in the mirror is themself and not another animal. This works on a number of species we all recognize to be intelligent like elephants, dolphins, and the great apes while, interestingly, other nonhuman primates like monkeys, will fail this test. Human children typically begin to pass the mirror test around the age of two.
I’ve always enjoyed watching chimpanzees look at themselves in the mirror. Some are more interested than others in their own reflections, usually picking at marks or scabs on their face and head, opening their mouths to inspect their teeth and tongue, and sometimes making faces at themselves. Are they amused? Are they curious? What’s happening in those minds?!
To celebrate this endearing behavior, I’ve decided to put together a compilation of photos and videos of the chimps at CSNW looking at their own beautiful faces. Enjoy!
