Smack! Smack! Smack! Hearing this coming from your baby’s mouth can be a little disconcerting. As a parent or caregiver, you expect your little one to smack their hand on the table or bang their toys, ...

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, ...

Two recent studies based at Princeton University suggest that the oral-facial component of human speech evolved from lip smacking, a friendly back-and-forth gesture performed by primates. The studies ...

Get unlimited access to ad-free articles and exclusive content. LiveScience The lip-smacking vocalizations gelada monkeys make are surprisingly similar to human speech, a new study finds. Many ...