Sidestepper

They are red crabs that walk side to side usually exposing teeth.They appear as obstacles in some Mario Kart games. ==Mario Bros. == Sidesteppers are the second enemies to appear in the whole series with Phase 4. Flip

Super Mario Advance
The game contains a new version of Mario Bros. entitled Mario Bros. Classic, but Sidestepper has also been added to the main Super Mario Bros. 2 game. When approaching Clawgrip, a short cutscene shows he is a Sidestepper, transformed into Clawgrip by one of Wart's magic bubbles.