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Also know as: Brown howling monkey, Bugio, guariba, macaco-uivador.Eleé famoso por seu grito, que pode ser ouvido em toda a mata, e pela presença de pêlos mais compridos nos lados da face formando uma espécie de barba.As their name suggests, vocal communication forms an important part of their social behavior. They have an enlarged basihyal or hyoid bone which helps them make their loud vocalizations. Group males generally call at dawn and dusk as well as interspersed times throughout the day. The main vocals consist of loud, deep guttural growls or "howls." Howler monkeys are widely considered to be the loudest land animal. According to Guinness Book of World Records, their vocalizations can be heard clearly for 3 miles (4.8 km). It is hypothesized that the