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Editor's note: They can smell ripe fruit up to 2 kilometers away, have crazy-long prehensile tails, and a special vocal chamber that helps them howl. Their cries are used to communicate among themselves and to warn other troops of monkeys to keep their distance. At around 140 decibels, their vocalizations are among the loudest on Earth for mammals. Enjoy them in their quiet form via some gorgeous Howler Monkey wallpapers!