Sea anemones are generally single, without bones, and their bodies are cylindrical. One end has a mouth, which is crack-shaped, with several rings of tentacles around it; the other end is attached to rocks or other objects in the sea. It is named because it looks like a sunflower. It uses stinging cells on its tentacles to paralyze fish, but anemone fish often swim among sea anemones and don't care at all, because their skin can secrete a protective mucus that allows them to swim in the sea anemone. There is no obstruction in the jungle. In addition to being attached to rocks, sea anemones are also attached to the shells of hermit crabs. In this way, the hermit crab wanders around, which will cause the originally immobile sea anemone to move around, expanding its foraging area. For hermit crabs, firstly, sea anemones can be used to camouflage; secondly, because sea anemones can secrete venom, they can kill the natural enemies of hermit crabs, so that both the sea anemone and the hermit crab benefit.