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This is Scientific Americans' 60-second science.

I'm Jason Goldman. Got a minute?

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 cock or spaniel, but they can sound as large as a tiger.

Biologists have long suspected

that the monkey's howls played a role in attracting mates. The sounds are like the auditory

version of peacock feathers or deer antlers that say, hey, check me out. And now we know that

the quality of the howl depends on a bone near their throats called the hyoid. The bigger the

hyoid, the deeper the howl. Males with deeper calls sound more attractive to females, which means

that males with smaller hyoids had to come up with another strategy. When you're in the field and you

look up at the monkeys, you notice that in Aluadah Palliata, that mantled haler monkey, that the testes are huge, and they're white.

They're really obvious.

University of Utah anthropologist Leslie Knapp.

She and her team found that howler monkeys face an anatomical tradeoff.

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