If you hear “lip smacking” noises at a zoo in Ohio, it could be the sound of a first-time mom taking care of her baby girl. Hasina, a “picture-perfect” mandrill mother, welcomed her first baby on June ...

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