Many animals in the world love to possess other people's things, such as the possession of other people's nest, possession of other people's food, possession of other people's labor. The hermit crab is one of them, so it always carries other people's shells on its own. On the surface, it's like having a home. When there is a situation, it will get into the shell, as if it can be protected. When it is free, it will come out again and run on the beach with a shell on its back all day.
Different from most crabs, the hermit crab has a long and soft abdomen and only the front of the body has a hard exoskeleton. Hermit crabs often hide in the shell of mollusks to avoid enemy attacks. The shape of the legs and claws of the hermit crab also helps to seal the entrance when other animals attempt to enter the shell. As the body continues to grow, the hermit crab needs to change its shell. When changing its shell, it will first use its pincers to carefully test the empty shell. If it is suitable, it will immediately drill into it. If there is a host in the shell, the hermit crab will take aggressive action, eat its meat first and occupy its home. For the hermit crab, finding a suitable empty shell is related to its own life and death. Therefore, when the shell is scarce, there is often a battle between the hermit crab and the hermit crab. It is not impossible to drive the hermit crab out of the shell. We can put the hermit crab in the water basin. When the water is not fresh, the hermit crab will run out. Even more, we can dig a small hole in the middle of the shell and stab the bottom of the hermit crab with sharp things to scare the hermit crab out.
Hermit crabs grow on the bottom of the sea. When they are young, they usually drift with the tide. When they grow up, some of them hide in shells and continue to live in the sea. Some climb on the beach and live in the empty shells of small conch. However, although they drift around, they still have to return to the sea when they want to breed and lay eggs.