Group size and mating preferences may have caused male primates, including humans, to evolve deeper voices than females. The findings can help to shed light on social behavior in humans and their ...

In mammals, social behavior and social status can substantially influence the survival, reproductive performance, and health of individuals. However, it is not yet fully understood how the translation ...

Add Yahoo as a preferred source to see more of our stories on Google. Japanese macaques at Joshin-etsu National Park in Japan. (Peter Adams / Getty Images file) (Peter Adams) Humans are far from the ...

New study finds that large group size and mating systems where males have multiple mates drove evolution of deeper male voices in primates, including humans UNIVERSITY PARK, Pa. — Deeper male voices ...

Rhesus macaques in U.S. research laboratories frequently pull out their own hair, pace in tight loops, and rock back and ...

Most of the contributions included were drawn from a symposium presented at the 1977 meeting of the Western Psychological Association in Seattle, Washington.

As animals go about their lives — eating, fighting, having babies — they don’t always follow the script laid out for them by Charles Darwin’s theory of evolution. Not every behavior furthers the cause ...