Crab (páng xiè): Animal kingdom, Arthropoda, Crustacea, Soft Crustacea, True soft armor Subclass, Decapoda, Gastropoda, Anura. It's a crustacean. Its body is protected by a hard shell and it breathes through its gills.

Taxonomically, it is the same kind of animal as shrimp, lobster and hermit crab. Most kinds of crabs live in the sea or offshore areas, and some live in fresh water or land. They rely on the mother crab to give birth to small crabs, and every time the mother crab will lay a lot of eggs, the number can reach more than millions. Crabs rely on the geomagnetic field to judge their direction. China has a long history of eating crabs, which is recorded in Yi Zhou Shu Wang Huijie and Zhou Li Tian Guan Bao Ren.

The number of such biological genetic materials is complex and has great differences, often as many as 100 pairs. Common crabs are hairy crabs (river crabs, hairy crabs, clear water crabs) and swimming crabs. China is rich in crab resources, among which the hairy crabs produced in Gucheng Lake, Taihu Lake, Gaoyou Lake, Yangcheng Lake, Crab House, Xinghua and Hongze Lake in the lower reaches of the Yangtze River are the top grade.

Crabs spend most of their time looking for food. They are generally not picky eaters. They can eat all the food they can get with their claws. Small fish and shrimp are their favorite, but some crabs eat seaweed, even animal carcasses and plants.

Crabs eat other animals, and other animals may also eat crabs. For example, humans regard crabs as delicacies, and waterfowl also eat crabs. Some fish also like to eat crab feet like humans. Young and underage crabs may be preyed by other marine life when they float in the sea in groups, so crabs have to lay a lot of eggs when laying eggs to ensure the survival rate of crabs.

They rely on the mother crab to give birth to small crabs, and every time the mother crab will lay a lot of eggs, the number can reach more than millions. After these eggs hatch in the abdomen of the mother crab, the larvae can leave the mother and float around with the coastal current.

After several times of molting, it grows into a big-eyed larva, and the big-eyed larva grows into a young crab after several times of molting. The appearance of the young crab is almost the same as that of an adult crab, and it becomes a crab after several times of molting. Most marine crabs are discharged directly into the sea without hatching after their eggs mature.