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ARAGUATO Howler monkeys are a genus of platyrrhine primates, ? it lives in the tropical zone, from southern Mexico, to northeastern Argentina. They are the most corpulent primates in America, since females reach more than 5 kilos, while males exceed 9. They live 15 to 20 years. They feed on leaves, although they occasionally eat fruits, seeds, flowers, and green shoots. A recently discovered feature consists of a compensatory mechanism of nature in species where there is great competition for females: the deeper the male's voice, the smaller his testicles.