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

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 ...

The "big truck, small man" phenomenon is also seen in the animal kingdom. The loudest howler monkeys were found to have the smallest packages. Hyoid bone size, which is responsible for vocalizations, ...

Howler monkeys are known for their booming calls that can be heard for miles, but the science behind their roar is even more intriguing. Studies show these vocalizations honestly signal body size and ...

Howler monkeys are the loudest land animals on Earth, capable of bellowing at volumes of 140 decibels, which is on the level of gunshots or firecrackers. Not surprisingly, male howlers frequently use ...

MEXICO CITY — It’s so hot in Mexico that howler monkeys are falling dead from the trees. At least 83 of the midsize primates, who are known for their roaring vocal calls, were found dead in the Gulf ...