The difference between this hairy crab and other hairy crabs is that it doesn't like crawling around like its peers, but likes to sit at the bottom of the water and taste "delicious" slowly.
Its appearance is very strange, like a tank, it is dark in color and good at hiding in the mud. Probably because of living in the water for many years, Mr. Hairy Crab has grown a layer of green aquatic plants on his shell. People who don't know thought it was the aquatic plants moving by themselves! No, since it was caught in the fish tank, it has been thinking about "jailbreaking" and no longer enjoys "delicious food" sitting in the water as before.
It crawled along the wall of the fish tank, but it never succeeded. So it gave up this "prison break" plan and squatted comfortably at the bottom of the fish tank to enjoy its big meal. If you don't believe me, come to my house and see this strange little guest!