Long-standing research in human psychology has claimed that certain facial expressions of emotion are universal across cultures. For example, classic cross-cultural studies by Paul Ekman and ...

The human facial action coding system, or FACS, has been developed as a tool for cross-species systematic comparisons of facial muscles to help interpret the resulting facial expressions of the common ...

Monkeys in Central and South America have amazingly diverse faces, from the white-mustached visage of the emperor tamarin to the boiled-lobster-red skin of the bald uakari. Now, research reveals that ...

There’s a lot we don’t know about gorillas. This is due to the lack of legal dead gorillas to dissect. And that means many details of our shared family tree remain unclear. For instance, we used to ...