A study of howler monkeys finds that to gain a mating advantage, species evolved either to make very low frequency sounds, or have much larger testicles, but none had both.
JAMES GORMAN, New York Times
Thu, 10/22/2015 - 10:29am
A study of howler monkeys finds that to gain a mating advantage, species evolved either to make very low frequency sounds, or have much larger testicles, but none had both.