It belongs to crustaceans, its body is divided into head, chest and abdomen, and there is a shell outside. There are five pairs of feet on both sides of the head and chest, but one pair is a pincer foot and four pairs are walking feet, so there are only eight feet. There are many kinds of them, some can live completely in fresh water, some can adapt to the life in the wild, but they need to go to the sea during the breeding period, and most of them are omnivorous.

brief introduction

From a biological point of view, crabs generally have 10 legs, because crabs are scientifically classified as arthropods. Many people think that crabs have eight legs. This is because some crabs are special, such as the king crab, which has two pliers and six legs.

Normal crabs can walk with eight legs, but two claws can't walk. The crab's chest has five pairs of appendages, which are called pectoral feet. A pair of appendages in front have powerful claws and are generally used for foraging. The other four pairs of appendages are crab feet, and walking and moving depend on them.