Howler mokey4/1/2023 Likewise, the size of a howler monkey's testes varies about seven times between the species with the smallest pair, about 3.5 cubic centimeters, and the one with the largest, about 23 cubic centimeters. The best measure of larynx size is the hyoid, a U-shaped bone that supports the tongue and larynx its size varies from only 8 cubic centimeters in some species to 110 cubic centimeters -14 times larger -in others. The sizes of howler monkeys' larynxes -the noise-producing voice box common to most mammals -vary widely among the 10 universally recognized species. Most researchers think that the racket helps fend off competition from other males. Primatologists have observed that the roars can go on for more than 40 minutes, a considerable investment in energy. Their vocalizations, among the loudest produced by any animal, resonate across the jungle, and can be heard from up to 5 kilometers away. Howler monkeys, members of the genus Alouatta and native to Central and South America, are famous for their powerful roars. You've got to attract mates, fend off competing males, and keep your sperm count high enough to finish the reproductive job. It's a man's world in many ways, but among primates, being a male still has its challenges. The results, she says, are "robust and clearly point to a trade-off." The study is "long overdue," says Dawn Kitchen, a physical anthropologist at Ohio State University, Columbus, who was not involved with the work. The findings shed important new light on the kind of evolutionary tradeoffs animals must engage in to ensure the survival of their species. A new study finds that the animals can make a lot of noise or a lot of sperm-but trying to do both just takes too much energy. Do males with bigger testicles have deeper voices? The jury is still out on humans, but if you're a howler monkey, forget about it.
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