Anemone

Giant green anemone

The giant green anemone and the slightly smaller aggregate anemone are both common in tidepools. They look very similar to one another. However, the giant green anemone is usually solitary, and the aggregate anemone lives in colonies of many individuals. Both are blue-green in color, which comes from algae living inside of them. Their tentacles capture and paralyze small animals, dragging them to their central mouths to be digested. At low tide they retract their tentacles to stay moist. Sand and gravel stick to their surfaces, serving as camouflage. They grow to 10 inches wide.