A sea anemone is a colorful marine animal that resembles a flower. It is part of the Cnidaria phylum, which also includes jellyfish and coral. Sea anemones have a soft, cylindrical body and tentacles that contain stinging cells called nematocysts. These tentacles help them catch small fish and plankton for food. Sea anemones are often found attached to rocks or coral reefs in shallow waters. They can come in various colors, including green, purple, and blue. Some species even have a symbiotic relationship with clownfish, which live among the anemone's tentacles for protection while providing the anemone with nutrients.