More than 90 different kinds of crabs live in Texas coastal waters. They are found in every type of habitat from the saltiest water of the Gulf to the almost fresh water of the back bays. Crabs Their favorite habitat is mud bottoms where they can burrow to lie in wait for prey or hide from enemies.
Crabs are crustaceans with five pairs of legs.
The first pair is modified as pinchers and the last four pairs are walking legs. Other common crustaceans are shrimps, lobsters, crayfish, and barnacles. It is also found on the East coast of South America and has been seen in the coastal waters of France, Holland, and Denmark. The back of the blue crab is dark or brownish green and is drawn out on each side into a large spine. When fully grown the spine may be more than 8 inches wide.