Calls vs. balls: Monkeys with more impressive roars produce less sperm

Thursday, October 22, 2015 - 12:30 in Psychology & Sociology

Evolutionary 'trade-off' between size of throat and testes discovered in howler monkeys furthers Darwin's theory of sexual selection and corresponds to mating systems: males with larger throats often have exclusive access to females, while those with larger testes share mates.

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