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10/23/2015 07:33 PM ID: 101172 Permalink   

Researchers: Howler Monkeys With Smaller Testicles Roar the Loudest


Howler monkeys are one of the loudest terrestrial animals on the planet. Researchers have recently found that the smaller a howler monkey´s testicles are, the deeper and louder his mating calls.

The scientists also say those with the loudest voices produce less semen and live in single-male groups with a harem of a few females.

The study, therefore, shows that Charles Darwin´s theory that the roars of howler monkeys play an important role in reproduction was probably right.

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