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Uploaded on Sep 12, 2006
Foustino and Coco the howler monkeys clearing their throats one lunchtime. July 2006, Parque Ambue Ari. Part of Inti Wara Yassi animal sanctuary, Bolivia. www.intiwarayassi.org
From wikipedia: "As their name suggests, vocal communication forms an important part of their social behavior. They each 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 20 mi (32 km). The function of howling is thought to relate to intergroup spacing and territory protection, as well as possibly to mate-guarding"