The food of wild crabs includes aquatic plants, benthic animals, organic debris, animal carcasses, snails, shrimps, small clams, small fish, etc. When feeding, they rely on their chelicerae to catch the food, and then bring the food to the mouth. Every year in the cool autumn season, they swim from the middle of the rivers in the interior to the estuary, and lay eggs in the interface waters of the river and the sea, in an environment where adult water and fresh water are mixed. The crabs hatch into young crabs when the weather warms up in the spring of the following year. Wild crabs like to inhabit mudflats or piles of rocks on the banks of rivers and lakes.

Crab:

The body of a crab is divided into cephalothorax and abdomen. The back of the cephalothorax is covered with a cephalothorax, the shape of which varies from species to species. There are 1 and 2 pairs of antennae in the center of the forehead, and compound eyes with stalks on the outside. The mouthparts include 1 pairs of large jaws, 2 pairs of small jaws and 3 pairs of maxillopods. There are 5 pairs of pectoral feet on both sides of the head and chest carapace. The abdomen is degenerated, flattened, and curved on the ventral surface of the cephalothorax. The male's abdomen is narrow and elongated, mostly triangular, with only the first two pairs of appendages deformed into connectors; the female's abdomen is broad, with 1 pairs of double-branched appendages on segments 2 to 5 each, densely covered with setae, used to hold eggs. Most crabs are marine, with the largest number of species in shallow tropical waters.