A study of our closest evolutionary relatives finds that the chimp behavior known as lip smacking occurs in the same timing range as human mouths during speech. Whether portrayed by Rex Harrison, ...

The lip-smacking vocalizations gelada monkeys make are surprisingly similar to human speech, a new study finds. Many non-human primates demonstrate lip-smacking behavior, but geladas are the only ones ...

Researchers are a step closer to solving one of the greatest puzzles of evolution, after discovering that chimpanzees smack their lips in a rhythm like that of spoken language. Chimpanzee language ...