Japanese Macaques, which inhabit Koshima Island, relax in a thermal spring.
In the far south of Japan, a young Japanese macaque named Imo introduced two habits. Both were very useful habits; they were picked up by the rest of her troop, showing that monkeys can develop traditions and pass them on. Studies on animals owe a debt to Imo and Koshima.
de Waal is a primatologist