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 ...

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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 ...

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 ...

When it comes to sex, you can’t have it all. Male howler monkeys are famed for their deep, powerful roars, which are among the loudest noises made by terrestrial animals, and may help them compete ...