Winter images - Joel Sartore

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ANI084-00425

A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab in Omaha, Nebraska, USA.

This weasel is a male and is in its white winter coat. In the summer, his coat will turn brown.

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ANI084-00424

A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab in Omaha, Nebraska, USA.

This weasel is a male and is in its white winter coat. In the summer, his coat will turn brown.

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ANI084-00423

A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab in Omaha, Nebraska, USA.

This weasel is a male and is in its white winter coat. In the summer, his coat will turn brown.

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ANI084-00422

A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab in Omaha, Nebraska, USA.

This weasel is a male and is in its white winter coat. In the summer, his coat will turn brown.

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ANI084-00421

A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab in Omaha, Nebraska, USA.

This weasel is a male and is in its white winter coat. In the summer, his coat will turn brown.

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ANI084-00420

A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab Center. This animal is in his winter coat of white. His coat will turn brown in the summer.

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ANI084-00419

A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab in Omaha, Nebraska, USA.

This weasel is a male and is in its white winter coat. In the summer, his coat will turn brown.

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ANI084-00418

A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab in Omaha, Nebraska, USA.

This weasel is a male and is in its white winter coat. In the summer, his coat will turn brown.

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HIS012-00071

A man stands in front of a cabin in Minnesota.

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A man stands in front of a cabin in Minnesota.

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A snowy portrait of a lakefront cabin in Minnesota.

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ANI084-00391

A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab. This individual is in a transitional coat (brown and white) from winter to summer.

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ANI084-00390

A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab. This individual is in a transitional coat (brown and white) from winter to summer.

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ANI084-00389

A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab. This individual is in a transitional coat (brown and white) from winter to summer.

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ANI006-00068

A male elk standing in snowy field near gentle rolling hills near Jackson Hole, Wyoming.

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Perforate reindeer lichen appear as white trees under snowfall.

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A herd of pronghorns graze near gas drilling rigs sunset near Pinedale, Wyoming.

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Joel Sartore on assignment for the Gray Wolves story.

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For the first time in decades, wolves again chase elk through the Lamar Valley of Yellowstone. The reintroduction of wolves has been a great success, drawing a new generation of visitors to the park.

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A Ferris wheel and the Eiffel Tower adorn the skyline in downtown Paris, France.

Picture of millions of monarch butterflies (Danaus plexippus) roosting on the Chincua Mountain near Angangueo, Mexico.

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Millions of monarch butterflies (Danaus plexippus) roost on the Chincua Mountain near Angangueo, Mexico. This is one of five wintering roosts for monarchs, where the cool mountain climate slows their metabolism enough for them to overwinter before migrating back northward in the spring. Logging threatens this spectacle–Already one of the five sites is no longer used by the butterflies due to the forest being cleared.