What kind of animal is blue crab?

A blue crab is a type of crustacean. It is a species of crab that is native to the Atlantic Ocean and the Gulf of Mexico. Blue crabs are also found in other parts of the world, including the Mediterranean Sea and the Black Sea. Blue crabs are typically blue or brown in color, and they have a hard shell and claws. They can grow up to 12 inches long and weigh up to 2 pounds. Blue crabs are omnivores, and they feed on a variety of plants and animals, including fish, shrimp, and mollusks. Blue crabs are also a popular food source for humans, and they are often caught for commercial and recreational purposes.