Divers call mantis shrimp "thumb splitters." The impact from a blow from the claws and head is only slightly less than the impact of a .22 caliber bullet.

Mantis shrimp can grow up to about ten inches in length and are fast moving. They eat crabs, anemones, and fish, among other things, and if kept in an aquarium with other fish, they will eventually eat them all. They dig burrows and live in crevices in reefs and rocks.

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