Taxonomically, it is the same kind of animal as shrimp, lobster and hermit crab.
Most kinds of crabs live in the ocean 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 large number of eggs, the number can reach more than one million. Crabs rely on the geomagnetic field to judge their own direction. The amount of genetic material of this kind of organism is complex and varies greatly, often as many as 100 pairs.
The nutritional value of crabs;
First, crabs contain a lot of protein, and most of them are high-quality protein. These high-quality protein also contain amino acids. Therefore, it has the functions of anti-infection and promoting wound healing.
Second, crabs contain arginine, which can participate in energy metabolism and detoxification in the body. Eating crabs in moderation can promote the energy balance of the body and play a good role in expelling toxins from the body.
Thirdly, crab meat contains a lot of nutrients, among which vitamin A and vitamin E are the highest. These two vitamins can protect mucosal epithelial tissue, soften blood vessels and resist aging.
Refer to the above? Baidu encyclopedia-crab