It is correct that a crab has 8 legs.

They are on each side of the body, and the crab's large pincers are not part of the crab's legs.

Normal crabs have a pair of pincer-like feet for digging, defense and attack, called chelipeds, while the remaining four pairs of feet are used for walking or paddling, called steppers. The chelicerae and the steppers do not have the same function, so technically a crab should have eight legs that can walk and two chelicerae that do not have the function of walking.

The crab is a crustacean (crustacean) whose body is protected by a hard shell and breathes through gills. In biological taxonomy, it is in the same category as shrimp, lobster, and hermit crabs. The vast majority of species of crabs live in the sea or offshore areas, with some inhabiting freshwater or land.

Crab Habits:

Crabs like to live in the mud banks of rivers and lakes or mudflat burrows, or hidden in rocks and water plants. In rivers where the tide rises and falls, they are mostly located between high and low water levels, while river crabs living in lakes and reservoirs have more dispersed burrows, mostly below the surface of the water, which are not easy to be found.

The crabs have a very mixed diet, feeding on water plants and humus under natural conditions, eating animal carcasses, and also enjoying snails, mussels, worms, insects, and occasionally preying on small fish and shrimp. Because of the crab's strong ability to endure hunger, generally ten days and a half months without food is not to starve to death. However, in June to September, the growth is vigorous, and the amount of food intake is large. Other months, often in a half-starved state. In the overwintering period, it is even more rarely eat.