Howler monkeys are New World monkeys which are found in tropical regions of South and Central America. It is named because of its cacophonous cries. They usually cry at dusk and dawn. Their cry could be heard up to 5 kilometers. Males have larger throats and specialized “shell-like” vocal chambers which turn up the volume of their call. This noise sends messages to other howler monkeys, for example: “This territory is already occupied by a troop. Howler monkeys move on all four legs on top of tree branches. They usually grasp a branch with two hands or the tail and a hand at times. These monkeys can use their tails as an extra arm for gripping branches or even hanging from them.
Howler monkeys (genus Alouatta) are one of the biggest of New World monkeys. Most of the howler monkey species live in group of ten to twenty, amongst which 1-3 are adult males, a few females and the young ones. Group size usually varies with species and also by location. Vocal communication in an important part required for social behavior. The Howler monkeys have an unusually enlarged hyoid bone that helps them to make loud vocalizations. The males in the group usually call at dawn or dusk, as well as other parts of the day. The cry consists of, deep and loud growls or "howls." These monkeys are considered as the loudest terrestrial animal, as per the Guinness Book of World Records. These monkeys mainly eat leaves, fruit, flowers, and nuts.
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