horn coral images - Joel Sartore

A horn coral (Hydnophora exesa) at the Indianapolis Zoo.

A horn coral (Hydnophora exesa) at the Indianapolis Zoo.

A horn coral (Hydnophora exesa) at the Indianapolis Zoo.

A horn coral (Hydnophora rigida) at the Akron Zoo.

A horn coral (Hydnophora rigida) at the Akron Zoo.

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National Geographic Photographer and Speaker