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 ...

If you liked this story, share it with other people. Brown howler monkeys (Alouatta guariba), endemic to the Atlantic Forest in Brazil and Argentina, became one of the 25 most threatened primate ...