A rare and deliberate signal between a mother chimpanzee and her daughter raises new questions about ape communication, culture and the meaning of sharing a language ...

Male chimpanzees use specific mating request gestures. Researchers stunned to discover cause of change in chimpanzee mating behavior: 'Rarely been demonstrated before' first appeared on The Cool Down.

Take the large cheek flanges of orangutans or the oversized noses of proboscis monkeys. But the ornaments don’t always match what’s under the hood, so to speak. A comparative study of more than 100 ...