Coral reefs are often called the rainforests of the sea., The Great Barrier Reef, off the coast of Australia, is the world's largest coral reef system., The coral provides shelter and protection for a wide variety of marine animals., Coral reefs are home to over 6,000 species of fish., Many species of rays, including manta rays, glide gracefully over coral reefs., Parrotfish eat the algae living on the corals and this helps to keep the reef healthy., The octopus, a master of disguise, can change both its color and texture to blend in with the reef., Crown-of-thorns starfish eat coral, so can pose a threat to the reef., The seahorse is the only fish species where the males become pregnant., The mantis shrimp, known for its powerful claws, can strike with the speed of a bullet and crack open hard-shelled prey.,

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