Size matters

Environment and Wildlife

Costa Rica’s howler monkeys are the least loud but most well-endowed

The Tico Times - October 26, 2015

For male howler monkeys on the search for a mate, size matters; but being a well-endowed monkey comes at a price. The results of a new study show that in some species of howler monkeys the larger a monkey’s testicles are, the smaller its voice.