Chimpanzees appear to execute Rational Evidence-Weighing in complex decision-making tasks. The experiments conducted demonstrated that chimps changed their minds when presented with stronger evidence.

How likely is a chimpanzee (Pan troglodytes) to steal food from another chimp? It depends on whether they’re a friend or a ...

ABUJA, Nigeria (AP) — A group of chimpanzees once used in laboratory hepatitis B vaccine experiments has received health checks at their new home in Liberia, in hopes of giving them a second chance at ...

Add Yahoo as a preferred source to see more of our stories on Google. In this handout photo released by Humane World for Animals, a chimpanzee formerly used in research receives a comprehensive health ...