A once large and peaceful group of chimpanzees in the western forests of Uganda has now split into two, causing a rare “civil war” among the primates.

Chimpanzees at Uganda’s Ngamba Island Sanctuary can do what was once considered an exclusively human trait: form expectations on the basis of evidence, but revise them on learning new facts.

One day in June 2015, primatologist Aaron Sandel was watching chimpanzees in Uganda’s Kibale National Park when he saw something that did not make sense. A small party of chimps from the Ngogo ...

There’s a new chimpanzee in the world, and it turns out to be one we’ve known all along. Jane Goodall’s pioneering study in Gombe National Park, Tanzania, began in 1960, well over a half-century ago.

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 ...

Chimpanzees from the Western group attacking members of the Central group in 2019. Aaron Sandel Since 1995, scientists have kept a watchful eye on the Ngogo chimpanzees in Uganda’s Kibale National ...