Howler monkeys (genus Alouatta monotypic in subfamily Alouattinae) are among the largest of the New World monkeys. They are famous for their loud howls, which can travel three miles through dense rain forest. These monkeys are native to South and Central American forests. Threats include human predation, habitat destruction and capture for pets or zoo animals. Fifteen species are recognized. Previously classified in the family Cebidae, they are now placed in the family Atelidae.