Michael Jackson once used sign language to tell his chimp, Bubbles, to sit down — a small moment that revealed their special connection. Bubbles, the pop icon’s well-known pet chimpanzee, lived with Jackson for years and regularly appeared by his side in public. | History In Pictures

Humans are naturally able to understand many of the signs - or gestures - that wild chimpanzees and bonobos use to communicate with one another, new research suggests. | BBC News