Crab

Crab, otherwise known as a Sidestepper, is an enemy. The little pests reside on beach courses (Cheep Cheep Beach, Shy Guy Beach, etc.) and move back and forth. They'll also snap at you, so it's not a bad idea to shoot them with a Green Shell (waste of a weapon, though. Use that on another racer, and knock them into one). You may also find them in 2-D, as an opposed to 3-D, and you'll always find them in possession of a vendetta against you. On Cheep Cheep Beach, the crabs will crawl into the water.