Posted by Doc Fungo on 10/23/2015, 9:12 am Original VIP Member
Beware loud-mouthed guys: Monkeys with smaller testicles roar the loudest to make up for their shortcomings
Howler monkeys are among the loudest terrestrial animals on the planet Males with larger throats tend to have smaller testes, study reveals Attract females with their roar, while those with larger testes share mates Research is the first evidence in any species of a trade-off between vocal investment and sperm production, University of Cambridge experts say ByColin Fernandez for the Daily Mail
It's long been suspected that loudmouths are trying to overcompensate for their inadequacies elsewhere. Now scientists have found that particularly loud howler monkeys, which are among the noisiest animals on the planet, have smaller testes and produce less sperm than their quieter peers. Scientists have found that howler monkeys, which are among the loudest terrestrial animals on the planet (an image of them vocalising is shown), have small testicles and produce little sperm Howler monkeys typically weigh about one stone (seven kilos) and are the size of a small dog, but their growl is deeper than a tiger's. This is to give the impression they are much bigger and stronger than they really are. Scientists have found that the deeper the howler monkey’s howl, the smaller their testicles are. Those they studied also produced less sperm. The new study has revealed an evolutionary ‘trade-off’ between investments in the size of the male hyoid - the bulbous, hollow throat bone that allows the howlers’ guttural roar to resonate - and in the size of reproductive organs, namely the testes. The bigger a male howler’s vocal organ, and the deeper and more imposing roar they possess, the smaller their testes and the less sperm they can produce. Scientists are currently studying human environments to identify similarities with the Howlers, with promising findings on an obscure Mississippi online message board...Posted by TigerFan on 10/1/2009, 1:48 pm
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