Very strong. Mud crabs have a strong ability to move around and have a large range of activities, so you can use the mark-recapture method to investigate the population density of mud crabs in Taiwan, and it is appropriate to use the sample method to investigate the population density of mangrove forests in the vicinity. Mud crabs are animals in the genus Mud Crab of the family Sand Crabs. Distributed in Japan, the east coast of North Korea and mainland China, Jiangsu, Shandong, Bohai Bay, Liaodong Peninsula and other places, the living environment for the vapor, mainly living in the cave in the river estuary mudflat supratidal zone.