The Smithsonian's National Zoo is inviting its Facebook fans to answer the call of the wild by naming one of the Small Mammal House's loudest and most charismatic critters: a baby black howler monkey ...

Hear the booming cries that gave the howler its name. Learn just what these vocal monkeys may be trying to say.

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 evidence of what ...

Why are capuchin monkeys kidnapping howler monkey babies in Panama? We investigate this bizarre case of primate abduction with researchers working with the Smithsonian to get to the bottom of this ...

Add Yahoo as a preferred source to see more of our stories on Google. This photo provided by researchers shows a baby howler monkey clinging onto a young adult male capuchin monkey on Jicarón Island, ...