Chimpanzee hands are remarkably similar to our own, from their ability to grasp and use tools to their unique fingerprints. While the exact function of a fingerprint’s various whirls, loops, and arches is still unclear, it’s thought that they might increase grip on some surfaces or improve tactile perception. Scientists have yet to specifically examine the grooming-with-a-chopstick origin theory. As far as I know, koalas are the only animals other than primates to have them – a cool example of convergent evolution.
