A normal crab has eight legs that can walk and two claws that can't walk. The crab's chest has five pairs of appendages, called pectoral feet. The front pair of appendages have powerful claws, which can be used for foraging. The other four pairs of appendages are crab feet. These four pairs of appendages have unique and interesting shapes, and most of them walk sideways rather than straight.
Habits of crabs
Hairy crabs are well-known aquatic products in our lives. After eating crabs for so many years, do you know the living habits of hairy crabs? Hairy crabs have five stages of development from hatching to developing into crabs: eggs, flea larvae, big-eyed larvae, young crabs and adult crabs. With the different forms of each development period, the living habits are also quite different. The larvae just hatched from eggs are called flea larvae, which live in seawater environment. Crabs in this period ate phytoplankton.
Hairy crabs like to live in mud flats or caves on mud flats in rivers, lakes and rice fields, and also like to hide in rocks and aquatic plants. The distribution of crab caves is related to their living environment. In tidal rivers, most of them are located between high and low water levels, while crabs living in lakes and reservoirs have scattered caves, most of which are below the water surface and are not easy to be found.