Fire crab is a magical creature that looks like a turtle, which is native to Fiji. Its shell has gems of different colors. When you think you are under attack, the fire crab's tail can spit out flames. Fire crab is a protected magical animal, so people built a reserve for them on the beach. This is not only to prevent muggles from wishing for their expensive shells, but also to prevent some wizards from making crucibles with their shells.