Printouts Coral polyps are small marine invertebrate animals. Most polyps live in large colonies. There are two types of corals, hard and soft.
Hard corals have an internal, rock-like, chalky skeleton that remains when they die.
Huge colonies of hard corals form coral reefs . Soft corals do not have a hard skeleton. Corals are found in seas around the world. Large colonies are found in some warm, shallow waters, where colonies of millions of coral polyps form vast coral reefs. It settles on a hard support and will never move again.