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

Add Yahoo as a preferred source to see more of our stories on Google. Orangutans, chimpanzees, bonobos and gorillas all engage in different forms of playful teasing, researchers report in the journal ...

(CNN) — Researchers have found a new way in which great apes are similar to humans: they tease each other. A new study by an international team of scientists has documented “playful teasing” in ...

Babies playfully tease others as young as eight months of age. Since language is not required for this behavior, similar kinds of playful teasing might be present in non-human animals. Now cognitive ...

In humans, sexual behavior has a bigger purpose than just reproduction. It plays a role in social functions, from strengthening bonds to resolving conflicts. A new study has extended sexuality's ...

Chimpanzees going through a midlife crisis? It sounds like a setup for a joke. But there it is, in the title of a report published Monday in a scientific journal: "Evidence for a midlife crisis in ...

"One result of nine-month 'Primate project' held at the Center for Advanced Study in the Behavioral Sciences, Stanford, California, during 1962-1963. Organized by Sherwood L. Washburn and David A.

Being a class clown is something that humans likely inherited from their ape ancestors millions of years before the first banana-peel prank, a new study claims. Everyone's seen kids tease one other, ...