Coral

Coral (many different species)
coral
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coral

Corals are marine animals typically living in compact colonies of many identical individual "polyps". The group includes the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton.
A coral "head" is a colony of many identical polyps. Each polyp is an individual animal typically only a few millimeters in diameter and a few centimeters in length.

Although corals can catch small fish and plankton, using stinging cells on their tentacles, most corals obtain the majority of their energy and nutrients from photosynthetic algae that live within the coral's tissue. Such corals require sunlight and grow in clear, shallow water, typically at depths shallower than 60 metres (200 ft).

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