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

Thirteen million years ago, a group of medium-sized monkeys known for guarding their territory among the treetops with fearsome "howls" started doing something new. These monkeys, among the oldest ...

Add Yahoo as a preferred source to see more of our stories on Google. Howler infant number 5 on the back of a juvenile capuchin carrier, who is using stone tools at an anvil site in a stream bed.

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

Add Yahoo as a preferred source to see more of our stories on Google. Here a white-faced capuchin monkey perches on a tree branch in Manuel Antonio National Park in Costa Rica. A group from the same ...

WASHINGTON – A baby howler monkey clung to the back of an older male monkey, its tiny fingers grasping fur. But they're not related and not even the same species. Scientists spotted surprising ...

Howler infant number 5 on the back of a juvenile capuchin carrier, who is using stone tools at an anvil site in a stream bed. Usually, this behavior in females is described as adoption, thought to be ...

According to the Three Wise Monkeys, it’s best to see no evil, hear no evil, and speak no evil. Researchers with the Max Planck Institute of Animal Behavior in Germany, as well as those from the ...

Observations of Coiba’s tool-using immature capuchin monkeys show them carrying abducted infant howler monkeys. What is the reason for this behavior? Vanessa Crooks Caught in the act! Capuchin monkeys ...

A capybara and a howler monkey have struck up an adorable friendship while sharing a habitat at the Denver Zoo Baya and Rebecca — the only two females in their enclosure — were seen snuggling as the ...

WASHINGTON (AP) — A baby howler monkey clung to the back of an older male monkey, its tiny fingers grasping fur. But they're not related and not even the same species. Scientists spotted surprising ...

If evolution had a sense of humor – its favorite punchline might be the howler monkeys. These tree-top vocalists are nature’s rock stars: dramatic, loud and convinced that volume equals value. They ...