STOCKHOLM, Sweden -- A chimpanzee who calmly collected a stash of rocks and then hurled them at zoo visitors in fits of rage has shown the animals can plan ahead just like humans, a study said Monday.

PETA attorney Brittany Peet shares how support for the Captive Primate Safety Act can change the lives of animals like Tonka the chimpanzee Brittany Peet, general counsel for captive animal law ...

LONDON (Reuters) - An angry chimpanzee will take revenge but -- unlike a human -- it will not do so out of spite, according to a study published on Monday that offers insights into how people perceive ...