cloudy images - Joel Sartore

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PEO020-00223

A man is bathed in the glow of his phone while on a bat bioblitz in the Big Bend Wildlife Management Area near Perry, Florida.

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PEO020-00221

A man is bathed in the glow of his phone while on a bat bioblitz in the Big Bend Wildlife Management Area near Perry, Florida.

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PEO020-00222

A man is bathed in the glow of his phone while on a bat bioblitz in the Big Bend Wildlife Management Area near Perry, Florida.

Picture of a skull of an American bison (Bison bison) on the Triple U Ranch near Ft. Pierre, South Dakota.

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ANI082-00171

A skull of an American bison (Bison bison) on the Triple U Ranch near Ft. Pierre, South Dakota. This ranch has about 2,000 head of bison on over 50,000 acres.

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ANI082-00172

A large herd of bison (Bison bison) running across the prairie on the Triple U Bison Ranch near Fort Pierre, South Dakota. This ranch has about 2,000 head of bison on over 50,000 acres.

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ANI082-00173

A deceased American bison (Bison bison) on the Triple U Ranch near Ft. Pierre, South Dakota. This ranch has about 2,000 head of bison on over 50,000 acres.

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ANI082-00174

A large herd of bison (Bison bison) running across the prairie on the Triple U Bison Ranch near Fort Pierre, South Dakota. This ranch has about 2,000 head of bison on over 50,000 acres.

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ANI082-00175

A large herd of bison (Bison bison) running across the prairie on the Triple U Bison Ranch near Fort Pierre, South Dakota. This ranch has about 2,000 head of bison on over 50,000 acres.

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ANI082-00176

A large herd of bison (Bison bison) running across the prairie on the Triple U Bison Ranch near Fort Pierre, South Dakota. This ranch has about 2,000 head of bison on over 50,000 acres.

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ANI082-00177

A large herd of bison (Bison bison) running across the prairie on the Triple U Bison Ranch near Fort Pierre, South Dakota. This ranch has about 2,000 head of bison on over 50,000 acres.

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ANI082-00179

A large herd of bison (Bison bison) running across the prairie on the Triple U Bison Ranch near Fort Pierre, South Dakota. This ranch has about 2,000 head of bison on over 50,000 acres.

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ANI082-00180

A large herd of bison (Bison bison) running across the prairie on the Triple U Bison Ranch near Fort Pierre, South Dakota. This ranch has about 2,000 head of bison on over 50,000 acres.