Although anemones look like harmless underwater plants, they are very active hunters, catching fish and small invertebrates with barbed tentacles. Although they are hydra-type, they can move slowly in their habitats. Their habitat is mainly the rocky seabed in shallow sea. When seawater is sucked into or discharged from their digestive cavities, their size will change dramatically. The largest anemone span exceeds 1 m.

Anemone is a kind of marine invertebrate with sucker-like feet. They look like colorful plants, not animals. Most anemones spend their lives fixed on hard objects such as rocks with sucker-shaped feet, and capture small animals swimming nearby with tentacles with barbed silk sacs. Anemones are carnivores. They prey on small marine life with tentacles with stinging cells. Their cells can release a toxin, paralyze their prey, and then send food into their mouths with their tentacles. Some jellyfish can produce deadly toxins, but the stings of anemones will not harm humans.