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.

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