If you lose your sight, you make up for it with other senses. If one arm is amputated, you learn to do twice as many things ...

It's a long held belief that loud mouths overcompensate for something, but in the case of howler monkeys, science has confirmed it's a biological fact.

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 ...