Muriqui Monkeys, However Gentle, Will Kill to Mate

The muriqui have a reputation as being one of the gentlest, most social of the primates—so much so that they've been dubbed the "hippy monkey."But even the sweetest of animals will turn murderous when deprived of basic needs—in this case, sex. New Scientist reports that a gang of six muriqui was spotted pulling a "Lord of the Flies" on an older male: