"Sea Anemones (Sea Anemones) Are Predatory Invertebrates"
"They have no skeleton. The supporting function of them takes the intestinal cavity. At the pole of the body is a slit-shaped mouth, surrounded by a nimbus of tentacles. Their tentacles have gills that are poisonous. Although sea anemones are mainly poisonous only for their prey, some species are toxic to humans. There are more than 1000 varieties. They feed on zooplankton, mussels, fish and shrimps. Sea anemones feed on food and excrete waste products through the same hole."
They are deep sea fish - when they are brought to the surface, the lower outside pressure causes deformations in their flesh and the viscera to come out.