A textbook-diagram-like image of a monkey's neurons firing after looking at another monkey eating a banana is a classic ...

After being rejected by his mother and bullied by other monkeys, a baby Japanese macaque named Punch captured the internet's attention for his heartbreaking bond with a stuffed orangutan toy. Featured ...

The Thinking Monkey is actually one-of-a-kind in Europe, originally photographed at the sunny seaports of Gibraltar. Here's a ...