By Kristine Sabillo With their bright red, hairless chests and grass-grazing lifestyle, gelada monkeys are quite unusual.

It's known that non-human primates have something humans have lost over the course of evolution ... including black and gold howler monkeys, tufted capuchins, black-capped squirrel monkeys ...

These membranes disappeared from humans through evolution to allow for more stable speech. These membranes allow monkeys to introduce "voice breaks" to their calls at the same rapid transitions in ...

It turns out apes and monkeys possess vocal membranes in their throats that humans lack. Scientists suspect these structures slowly disappeared through evolution to allow for more stable speech. So ...

in the celebrated “monkey trial.” Enacted on March 21, 1925, the Butler Act forbade Tennessee educators “to teach any theory that denies the story of the Divine Creation of man as taught in ...

allow monkeys to introduce voice breaks to their calls. These structures disappeared from humans through evolution to allow for more stable speech. Authors of the study, published in the journal ...

With their bright red, hairless chests and grass-grazing lifestyle, gelada monkeys are quite unusual. They are the only primate, other than humans, to primarily live on land instead of in trees ...

allow monkeys to introduce voice breaks to their calls. These structures disappeared from humans through evolution to allow for more stable speech. Authors of the study, published in the journal ...