Exploring a Reef

A scuba diver explores elkhorn corals (Acropora palmata) growing on a tropical reef. Coral reefs provide recreation and inspiration for millions of people every year. Elkhorn coral is listed as Critically Endangered on the IUCN's Red List of Threatened Species.

A scuba diver explores elkhorn corals growing on a tropical reef.
OAR/National Undersea Research Program (NURP)

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