Study: The louder the howler monkey, the smaller his testicles
Thursday, October 22, 2015 - 14:30
in Psychology & Sociology
Brooks HaysCAMBRIDGE, England, Oct. 22 (UPI) -- Howler monkeys can't have it all. Evolution offers a choice: big balls or big calls. The choice dictates not only physical attributes, but a style of living.