A group of whitetip reef sharks rest under a ledge on a wall at the small, remote island of Roca Partida, one of four islands that make up Mexicos Revillagigedo archipelago. The islands are located between 220 and 400 miles south of the southern end of the nations Baja peninsula in the eastern tropical Pacific. (Photo by Marty Snyderman/Caters News Agency)
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