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When a chimpanzee goes to sleep, it first has to build a "nest", which allows it to sleep safely up in the trees. Strangely, chimpanzees also build nests when sleeping on the ground, which might reveal a secret about human evolution. More »
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There are four genetically distinct chimpanzee populations, all found in two relatively small regions of Africa. And yet these populations, which are sometimes less than a mile apart, are more genetically diverse than humans that li... Read Post

Just like humans, chimpanzees yawn when they're bored or sleepy, and they also yawn contagiously when they see another chimp do it. That discovery could help unlock the secrets of human empathy. More » Read Post

The first study into rarely documented ground-nest building by wild chimpanzees offers new clues about the ancient transition of early hominins from sleeping in trees to sleeping on the ground. While most apes build nests in trees, ... Read Post