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 ...

The throat and facial movements that twist the air pushing through your vocal cords into words could be rooted in the well-meaning expressions primates exchange with each other, according to two ...

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, ...