Fossils show that howler monkey ancestors, Stirtonia victoriae, were eating leaves 13 million years ago, altering body size ...

Fossils show that howler monkey ancestors were eating leaves 13 million years ago, shaping body size and evolution.

For decades, scientists believed that bonobos, one of our closest living relatives, were among the most peaceful primates.

An extinct relative of the howler monkey may have been the first leaf-eating primate in South and Central America ...

Scientists are finally decoding the orgasm face. Explore how human evolution, primate behavior, and mate selection shape our expressions of climax.

Historically considered a more peaceful species than their chimpanzee cousins, bonobos are actually just as aggressive -- but target their ire most often at males, according to a study published ...

Humans perceive emotional expressions displayed by non-human primates and spontaneously mimic these expressions, according to ...

Humans perceive emotional expressions displayed by non-human primates and spontaneously mimic these expressions, according to a study published March 11, 2026, in the open-access journal PLOS One by ...

Thirteen million years ago, a medium-sized monkey known for guarding its territory among the treetops with a fearsome “howl” started doing something new. This monkey, one of the oldest known ancestors ...

In the dense forests of Panama’s Jicarón Island, an unexpected and puzzling behavior has emerged among capuchin monkeys: they have been observed carrying baby howler monkeys, a phenomenon that ...

Young primates in a southern African nature park were observed to constantly interfere when their mother was giving attention to a younger brother or sister. By Annie Roth Annie Roth has reported on ...