By Victoria Gill
Science reporter, BBC News
23 October 2015
The deep, growling roar of the howler monkey may hide reproductive shortcomings, according to biologists.
A study by an international team of scientists has revealed that the primates either develop big voices, or big testes - but not both.
Scientists made the discovery while trying to understand the "evolution of the animals' incredible roars".
The findings suggest such evolutionary trade-offs may be more common that previously thought.
They are published in the journal Current Biology.
Howler monkeys are named for their impressive howling roars - sounds they make to intimidate rivals and impress potential mates.
And their anatomical musical instrument is a bone in their throat called the hyoid bone, which acts as a resonator
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