A new study posits that same-sex sexual behavior developed to help primates in complex social groups ease tension, reduce ...

As early humans spread from lush African forests into grasslands, their need for ready sources of energy led them to develop a taste for grassy plants, especially grains and the starchy plant tissue ...

The act of kissing may have started long before modern humans existed, a new modeling study suggests. Kissing stretches back roughly 21 million years, to the shared ancestor of humans and other large ...

Primates form same-sex sexual behavior alliances to gain rank and mating opportunities Male primates use same-sex bonds as ...

Prologue -- The structure of this book -- Six paradigms -- 1. Introduction -- Some premises -- Some history -- Evolution and modification of behavior -- Evolution of ontogeny in the human animal -- ...

This has been quite the wild year in human evolution stories. Our relatives, living and extinct, got a lot of attention—from new developments in ape cognition to an expanded perspective of a ...

Biologists tend to look at the animal kingdom and try to categorize things in an organized fashion. But nature has a way of ...

Human evolution’s biggest mystery, which emerged 15 years ago from a 60,000-year-old pinkie finger bone, finally started to unravel in 2025. Analysis of DNA extracted from the fossil electrified the ...

Human behavior is a tapestry woven from culture, environment, and biology. Among the most intriguing aspects of this tapestry is risk-taking—those bold, sometimes reckless decisions that can lead to ...