A big difference between humans and other apes is the ability to stride easily on two feet. A new analysis of fossil bones shows that adaptations for bipedal walking go back 7 million years.

IF YOU'VE ever watched your cat stare intensely out the window at a bird, making that peculiar "ek-ek-ek" chattering sound ...

A variety of studies are showing that rough-and-tumble play is important for animals and kids alike.

Scientists researching primates, called "primatologists," have learned a lot over the years about our closest evolutionary ...

Why does a glass of wine make a holiday party feel more festive? It might be because our forebears used to party. Not the ancient Greeks, though they did name a god of wine. Go back even further than ...

This video uncovers six primate species whose behavior and appearance stretch the limits of what most people expect from the animal world. Scientists explain the peculiar adaptations behind their ...

A new study that examines how kissing evolved suggests that ape ancestors and early humans like Neanderthals probably locked lips with their friends and sexual partners. The behavior may date back 21 ...

A clay model from Mesopotamia shows an evidence of the first human kiss in recorded history. Credit: The British Museum / CC BY-SA 4.0 The first kiss may have happened long before humans existed, with ...

AMSTERDAM, Nov 19 (Reuters) - Kissing did not begin with star-crossed human lovers but with the primate ancestors of great apes around 20 million years ago, according to a study published on Wednesday ...

Kissing occurs in a variety of animals, but presents an evolutionary puzzle: it appears to carry high risks, such as disease transmission, while offering no obvious reproductive or survival advantage.

Saliva is a bodily fluid most of us take for granted despite the significant roles it plays in aiding digestion, maintaining strong teeth and defending against oral disease. However, the evolution of ...