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http://www.youtube.com/watch?v=XSmu5...eature=related....
"Communication
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 sound. They are considered the loudest land animal. According to Guinness Book of World Records, it can be heard clearly for 3 miles (5 km)."
Have you fucked yourself in your mouth with your cartoon foot yet?
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http://en.wikipedia.org/wiki/Howler_...#Communication...