There are fifteen species of Howler Monkey, spread across the forests of Central and South America. They are most famed, and named, for their loud howling call, which can travel up to five kilometres, and is used to define the boundaries of their territory and communication. They are widely considered to be the loudest land animal. Troops consist of up to 15 individuals, with a few adult males and the rest comprised of females. Once they become self-sufficient, juveniles leave their natal troop to join another. His sense of smell is very keen, and he is capable of scenting fruit from up to 2 kilometres away.