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Some species of snakes are cannibalistic, meaning that they will eat their own kind. Members of the genus Agkistrodon (cottonmouths, copperheads and cantils) and Lampropeltis (king snakes and milk snakes) are especially notorious for doing this, but any snake might give it a shot if it is hungry and its cagemate is smaller than it is. Watch breeding pairs carefully, and make sure they are roughly the same size.