Add Yahoo as a preferred source to see more of our stories on Google. Human evolutionary science has long been caught up in a debate: Did our last common ancestor with apes walk on its knuckles, like ...

Walking upright all the time is one of the unique features that sets Homo sapiens apart from other primates still around today. But, before we stood up and started strolling, how did our ancestors ...

Chimpanzees showed a remarkable attraction to crystals, choosing them over ordinary stones and studying them with intense ...

The research, published in the journal Communications Biology, compared laughter recordings from orangutans, gorillas, ...

There are many kinds of laughter. People may guffaw at a joke. They may giggle nervously in an uncomfortable situation. They ...