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

How can we compare human and machine intelligence when we can’t decide which species – cats or dogs — is more intelligent?

A new study has the clearest evidence yet that territorial expansion after lethal conflict can directly boost reproductive ...

The San Francisco Zoo announced Thursday it will say goodbye to its three remaining chimpanzees as it temporarily shutters ...

Researchers studying animal behaviour say mouth-to-mouth kissing likely appeared in the common ancestor of humans and great apes more than 21 million years ago.

A study led by Oxford University argues that kissing evolved in the common ancestors of humans and apes, and that our extinct ...

It is not a recent cultural development. A new study in Evolution and Human Behavior suggests kissing may date back 21 ...

Humans aren’t the only ones who kiss—monkeys do it, polar bears do it, and now research suggests that the practice may go ...

The global search for the most intelligent animals has become one of science’s most captivating pursuits. From jungles to ...

A new study looks at how the mouth-on-mouth smooch came into being, and concludes that Neanderthals also kissed.

New research suggests the first kiss occurred 16.9-21.5 million years ago between ape ancestors in Africa. Scientists ...

For decades, anthropologists have wondered whether kissing is an evolutionary thing or a unique cultural quirk we humans ...