Man dashes down dunes at Sand Dunes National Park

Photo: Daniel Schwen/500px

A man kicks up sand behind him as he dashes down the side of a dune on a hot June day in Sand Dunes National Park and Preserve, an 150,000-acre government-protected sandbox in southern Colorado. Though it's known for its sand dunes — the largest in North America — the park also contains a diversity of ecosystems.

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Catie Leary is a photo editor at Mother Nature Network. Follow her on Twitter and Google+.

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Catie Leary ( @catieleary ) writes about science, travel, animals and the arts.