What is a crawfish?

Crawfish are freshwater crustaceans closely related to the lobster. They are known also by other names such as crayfish, crawdads, red claw, and mudbugs (they don't eat mud, they just live in it sometimes and they are not bugs). Crawfish are crustaceans – they have a shell and five pairs of legs. As they grow, they molt their shells and grow new ones. Crawfish are sold for consumption, for bait and for pets.

Here is a picture of a crawfish visiting San Francisco.