Corals are marine organisms from the class Anthozoa and exist as small sea anemone–like polyps, typically in colonies of many identical individuals, notes Wikipedia.
The group includes the important reef builders that are found in tropical oceans, which secrete calcium carbonate to form a hard skeleton.
A coral "head", commonly perceived to be a single organism, is formed from thousands of individual but genetically identical polyps, each polyp only a few millimeters in diameter. Over thousands of generations, the polyps lay down a skeleton that is characteristic of their species.
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