Sea Anemones.

A sea anemone looks a lot like a flower, but it's actually a marine animal. In fact, it's named after the beautifully-colored anemone flower. The oceans of the world contain over 1,000 different species of sea anemones. The largest sea anemones can usually be found in coastal tropical waters, though. They come in just about any color, and they can range in size from a half-inch to more than six feet in diameter. Sea anemones are close relatives of coral and jellyfish. Their bodies are hollow columns with a mouth and stinging tentacles at the top. Sea anemones mostly live attached to rocks on the sea floor or on coral reefs. They wait for small fish and other prey to swim close enough to get caught in their stinging tentacles.