Born noisemakers. Everyday in the early morning and at dusk, Yucatan black howler monkey troops let loose a chorus of loud rumbles, growls and howls; the crescendo can be heard up to two kilometers away. Both males and females use their specialized voice boxes to howl, with males demonstrating their howling prowess to show dominance and ward off interloping males from other groups. But these decibel-raising denizens of the forest canopy are falling silent in alarming numbers due to deforestation, habitat disturbance and hunting.
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