Corals are living animals.
They build a foundation of hard calcium rock that is the coral reef. Other animals, like sponges, live on the reef. Many fishes eat corals, live in the crevices of the coral reef, sleep under the ledges of the reef, and depend on the healthy reef for their survival. Corals live in warm oceans. Photos of Corals Brain Coral Cayman Brac Coral Head includes Star Corals and Sponges Individual Coral Polyps A Mountainous Coral Head Soft Coral gives refuge to a Trumpetfish Star Coral provides shelter for a Christmas-Tree Worm .