There are so many types of marine animals with different shapes. How much do children know? Below, the editor of Animal House has compiled some relevant knowledge about marine animals for you. I hope you will like it. 1. The smallest sea crab--the bean crab is a small crab that lives in shallow seas. The bean crab is 3.8─4.2 mm long, only as big as a grain of rice. It can be called a dwarf among crabs. It is the smallest crab in the world. It is also similar to red adzuki beans, so it is called ...