Crabs can eat bread crumbs, rice dregs, small fish, shrimp and other things to maintain life. Crabs are omnivorous animals. Common crabs are Portunus, pelagic Portunus, green crab and Chinese Mitten Crab (river crab, hairy crab, clear water crab), etc. What does a crab eat to maintain its life
The body of a crab is divided into head, chest and abdomen. The back of the head and chest is covered with head breastplate, and the shape varies from species to species.
In biological taxonomy, crabs are similar to shrimp, lobster and hermit crab.
Crab is a crustacean of Decapoda, a class of soft beetles. Its body is protected by a hard shell and breathes by gills. （PangXieChiShaDongXiWeiChiShengMing）