In 2015, on Japan’s forested island of Yakushima, a male macaque jumped up onto the back of a female sika deer and started trying to mate with it. At the time, researchers believed that the male ...

If it weren’t for a cheeky monkey named Naruto, who, as the story goes, stole a photographer’s camera in an Indonesian park and snapped a selfie, crested black macaques might still be ...