Howler Monkey
Alouatta spp.
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Howler monkeys consist of nine species in the same genus and are among the largest New World primates. They exhibit sexual dimorphism, as males are considerably larger than females and also sometimes show differences in colour. Their colouration ranges from light brown to black, but howler monkeys have a high degree of individual variation. They have an enlarged hyoid bone and exaggerated angle of their lower jaw enabling loud distinct howling calls. Their calls are said to be the loudest noise produced by any animal. The calls are made by the males allowing for the assessment of neighbouring troops. The underside of their prehensile tail is bald for the last third allowing for grip as they swing through the canopy. Groups normally consist of around 10 – 20 individuals.
