Chimpanzees change their choices when stronger clues appear and stay the course when only weaker hints came in.

A study reveals chimpanzees exhibit evidence-based reasoning, challenging the belief that rational thought is uniquely human.

Engelmann says that from the beginning of the Western intellectual tradition, people thought that only humans are rational.

Chimps may revise their beliefs in surprisingly human-like ways. Experiments showed they switched choices when presented with stronger clues, demonstrating flexible reasoning. Computational modeling ...

It’s the strongest evidence yet that we share the planet with another rational being,” said Duke University evolutionary ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

New research suggests chimpanzees can rethink their choices when new evidence emerges, a hallmark of human-like reasoning.

If there was ever any doubt about the impact Jane Goodall had on the field of animal research, one Instagram video explains it all.

The San Francisco Zoo is soon saying goodbye to its three chimpanzees -- Twiggy, Gombus, and Michael -- as it plans to ...

ANIMALS respond to injury in many ways. So far, evidence for animals tending wounds with biologically active materials is rare. Yet, a recent study of an orangutan treating a wound with a medicinal ...