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barnacle a small sea animal that attaches its shell to rocks, the bottom of ships, docks, and other objects in shallow parts of the ocean. Barnacles float freely in the ocean when they are young. They develop shells with sharp edges as adults. Barnacles are kinds of crustaceans.
conch a sea animal with a soft body and a large, spiral shell. Conches are carnivorous mollusks that eat smaller mollusks such as clams. Several kinds of conches live in warm parts of the ocean all around the world. Conches are closely related to snails. [1/2 definitions]
coral the hard skeleton of tiny sea animals called corals. Most kinds of corals live in warm tropical oceans, and their thousands of skeletons form reefs and atolls. [1/3 definitions]
coral reef a structure that rises up from the bottom of the sea and is made up of the hard skeletons of tiny sea animals called corals. Coral reefs are found in warm, shallow sea waters around the world. The largest system of coral reefs is found in the Coral Sea off the northeastern coast of Australia.
octopus a sea animal with a soft, rounded body and eight long tentacles. Octopuses are carnivores that eat crabs, lobsters, and other small sea animals. They are mollusks and are closely related to squids.
school2 a large group of the same kind of fish or sea animals.
sea anemone a small sea animal with many tentacles. It looks like a flower. Sea anemones are related to jellyfish, but unlike jellyfish they spend their entire lives attached to underwater objects.
seafood any sea animal that is served as food.
seashell the shell of an oyster, clam, or other sea animal. Seashells are often found washed up on shore.
sea urchin a small sea animal with a soft body inside a hard, round shell. Its shell is covered with long, thin spines. Sea urchins are related to starfish.
sponge a sea animal that has a body with many small holes or channels that water can flow through. Sponges are often shaped like a fat tube. Thousands of kinds of sponges live in the ocean. Most kinds of sponges live in groups, or colonies, on coral reefs, rocks, shells, or other objects. [1/5 definitions]
squid a sea animal with a long, soft body and ten strong tentacles. Squids are carnivores that eat other sea animals. They are mollusks and are closely related to octopuses. Squids range in size from quite tiny to over forty feet.
starfish a sea animal with a flat body and five or more arms. Starfish live in shallow parts of the ocean. They are carnivores that eat clams and other mollusks. They are also called sea stars.