Most of us do it, be it romantic, familial, friendly or formal, but kissing among humans and where and how it originated is still hotly debated among historians and anthropologists. Now a new theory ...

Same-sex behavior is widespread in primates and may help strengthen social bonds and improve survival under challenging ...

Carnivores, typically more active at night, became more active during the day when tourists were present. Herbivores, in response, shifted their waterhole visits to nighttime, potentially increasing ...

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