Chimpanzees' personality traits are linked to the anatomy of specific brain structures ... scans and also assessed each chimpanzee's personality by using a 41-item personality questionnaire.

A pair of studies finds that chimp communication includes both rhythmic structures and call combinations, two key elements of spoken language. Taken together, the studies add to an emerging "early ...

In a study of chimpanzee and monkey anatomy, primate arms provide hints about how our ancestors got to the ground in one piece. By Miriam Fauzia Millions of years ago, a simian ancestor of ...