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 ...

Howler monkeys. From their Central and South American rainforest home, they produce some of the loudest animal calls in the world. They’re about the size of an adult cocker spaniel, but they can sound ...

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 ...

For howler monkeys, it appears the louder the calls, the smaller the — ahem — balls. A research team looking into the monkeys’ incredibly loud and low vocalizations, and the physical structures that ...

In his 1871 book on evolutionary theory called “The Descent of Man, and Selection in Relation to Sex”, Charles Darwin posited that sexual selection was determined in two main ways: through combat, or ...

The rather sinister, guttural croak of this large South American primate reaches an impressive 140dB, far exceeding the 70dB ...