Butterflyfish depend on living coral for shelter and food.
Butterflyfish are in the family Chaetodontidae
Corals are small animals (polyps) that are closely related to sea anemones and jellyfish.
Most corals create colonies, by growing a large rocky skeleton that we see as a solid coral rock. The soft bodied polyps live in the outer edge of this skeleton, on top of the empty skeletons of previous generations. Only the outer layer of a coral boulder is alive.