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 ...
ZME Science on MSN
Monkeys with smaller testicles scream louder to compensate
It's a long-held belief that loud mouths overcompensate for something, but in the case of howler monkeys, science has ...
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