Nonhuman primates like bonobos and chimpanzees might engage in same-sex sexual activities to strengthen bonds, particularly ...

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 ...

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

The researchers found that same-sex behavior was more common in primate groups with clear hierarchical structures and those ...

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 ...

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 ...