Seeanemonen, or sea anemones, are marine animals belonging to the phylum Cnidaria. They are closely related to corals and jellyfish and are known for their colorful, flower-like appearance. Sea anemones have a soft, cylindrical body and tentacles that contain specialized cells called nematocysts, which they use to capture prey and defend against predators. These creatures typically attach themselves to rocks or coral reefs in shallow waters. They can be found in various ocean environments, from tropical to temperate regions. Sea anemones often form symbiotic relationships with clownfish, which provide protection and food in exchange for shelter among the anemone's tentacles.