Just so you know: Howler monkeys with deeper, louder voices have smaller testes and less sperm

(ICR Archive)

October 23rd, 2015 -

Howler monkeys with lower calls have smaller testes, according to new research. Amongst howlers, more resonant and lower calls are thought to signal better genetic quality and larger body size, and those males with more impressive “howls” tend to intimidate more males and attract more females to mate with. Leslie Knapp, a primatologist and anthropologist at…