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It may also stabilize the shrimp when it swims backward.Two bulbous eyes on stalks sit either side of the rostrum.
The rostrum, from the Latin rōstrum meaning beak, looks like a beak or pointed nose at the front of the shrimp's head.
It is a rigid forward extension of the carapace and can be used for attack or defense.
Some species have rudimentary pleopods, which give them some ability to swim, and like shrimp they can lobster with their tail to escape predators, but their primary mode of locomotion is walking, not swimming.
Crabs evolved from early shrimp, though they do not look like shrimp.
The carapace typically surrounds the gills, through which water is pumped by the action of the mouthparts.