White-faced capuchin monkeys on Jicarón Island have started abducting baby howler monkeys, surprised scientists report. It’s possible this behavior comes in waves, but it had not been detected in the ...

Howler monkeys are relatively small primates known for their incredibly loud, low-frequency roars that sound as if they come from a much larger creature. This is useful in the animal kingdom because ...

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 ...