A crab has eight legs and two pincers.

Ordinary ones have two pincers and eight legs, and there are special ones, such as the king crab, which has two pincers and six legs. Xunzi's persuasion there is a sentence:Crab six knees and two chelae, non-snake eel hole can not be hosted. This refers to this kind of crab with six legs and two pincers.

Normal crabs have eight legs that can walk, and two chelicerae that do not have the function of walking. The crab chest cavity has five pairs of appendages, known as thoracic feet, a pair of appendages in front of the strong chelipeds, can be done to forage for food, the remaining four pairs of appendages is the crab's feet, walking and moving to rely on these four pairs of appendages, walking in a unique and interesting appearance, most of them are walking horizontally rather than straight ahead.

Expanded Information:

Crab Habits:

River crabs usually like to live in clean water, abundant grass in rivers and lakes, and in the ponds, they are often hidden in the silt at the bottom of the pond. River crabs come out day and night, in the bait rich, environmentally appropriate to settle, once mature, will abandon the hole away. River crabs grow in freshwater and reproduce in seawater.

Crabs spend most of their time searching for food, and they are generally not picky eaters, eating whatever their chelipeds can get their hands on, with small fish and shrimp being their favorites, though some crabs eat seaweed, and even dead animals and plants.

They rely on their mother crabs to give birth to their young, and each time she lays a large number of eggs, up to millions or more. Once these eggs hatch in the mother's abdomen, the young can break away from the mother and float around on coastal currents.

After a few retreats, it grows into a large-eyed larva, which then grows into a juvenile crab after a few more retreats, which is almost identical in appearance to the adult crab, and then becomes a crab after a few more retreats. Most saltwater crabs are discharged directly into the ocean without hatching after their eggs mature.

Baidu Encyclopedia-Crab