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, ...

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 ...

When presented with multiple clues about the location of food, chimps revised their choices based only on stronger clues, indicating they were comparing the worth of pieces of information ...

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

"In theory, you could break any link." Scientists discover concerning behavioral changes in chimps: 'Could something so small ...

When I talk about my time in the field, and how wonderful and fascinating chimpanzees are, one thing that often surprises people is that chimps eat meat. Listeners are truly shocked—"Wait what?" they ...

Alpha male Herbie, from left, and females C.J. and Emma gather together while socializing at the Freedom for Great Apes chimpanzee sanctuary in Tumalo on Wednesday morning. Herbie fluffed out his ...

Chimpanzees (Pan troglodytes) are native to the forests and savannas of central and western Africa. These creatures are our closest living relatives and share approximately 98.8% of our DNA. Similar ...