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Sea Cucumber
One animal that lives in reefs is called the sea cucumber. It is an animal but is called "cucumber" because of its shape. It has a long body, covered by a leathery exterior. Its mouth is at one end, and it gathers silt along the bottom. The silt has nutrients, which the sea cucumber eats. It is from the kingdom of animals called echinoderms, which means spiny exterior skins.
Sea Anemone
Sea anemones (also called true anemones) have long tubelike tentacles that they use to gather food. The tentacles have stingers with venom. When a small fish is caught by the tentacles, it is paralyzed. Its mouth is in the middle of the tentacles, below them. Some anemones can reach 18 inches in diameter. A curious fact is one type of fish, called the damselfish, is not attacked by the anemone's venom. Rather, the fish hides in between the tentacles.
Peanut Worm
Peanut worms are rare, but they inhabit coral reefs. According to Encyclopedia Britannica, these worms can grow to more than 1 1/2 feet in length. Their mouths are at one end and surrounded by a ring of tentacles. They burrow into the coral and undersea floor, waiting for small animals to pass by with the currents.
Tube Anemone
A tube anemone is a distant cousin of the true or sea anemone. Another name for this anemone is the burrowing sea anemone. Although similar in appearance to sea anemones, they have very long bodies and burrow into the silt surrounding the reef. Unlike true anemones, they have no feet. The mouth is surrounded by short tentacles that it uses to harvest food. It buries itself so deep that only the tentacles are visible above the silt.