What are ‘corals’?

Corals are small (sea anemone-like) colony-forming marine invertebrate animals from the class Anthozoa of phylum Cnidaria. They are without the head and are radially symmetrical.
            Some of them feed on plankton.
            Some are ‘reef-builders’, which secrete CaCO3 to form a hard skeleton – reefs – around them. The coral reefs are colourful, that way they are attractive and very pleasant to look at. The colour, size, shape or design of the coral reefs vary according to the coral-genus that produce the reef.
            They grow well in the depth range of 30–70 m and over the temperatures of 20–30°C. They are really fascinating that when we look at them in their natural habitat, they give the impression, as if some other wonderful world has appeared before us in our world. We have placed few coral reef pictures in this site for you to see and admire at the beauty.