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, ...

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 ...

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 ...