Charlie Summers / American Pika (Ochotona princeps) leaping from one alpine rock to another as it heads to its home carrying food for the winter months. Rocky Mountain National Park, Colorado, USA. August.
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David Tipling / Looking down on the vast King Penguin (Aptenodytes patagonicus) colony at Salisbury Plain, South Georgia.
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David Tipling / View down on the vast King Penguin (Aptenodytes patagonicus) colony at Salisbury Plain, South Georgia.
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Jeff Foott / Pika (Ochotona princeps) in Bridger National Forest, Wyoming Mountain Range, Wyoming, USA, June.
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Jeff Foott / Pika (Ochotona princeps)on hay pile, in Bridger National Forest, Wyoming Mountain Range, Wyoming, USA, June.
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Jeff Foott / Pika (Ochotona princeps) in Bridger National Forest, Wyoming Mountain Range, Wyoming, USA, July.
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Jeff Foott / Pika, (Ochotona princeps) bringing vegetation to Hay pile, in Bridger National Forest, Wyoming, USA, July.
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Jeff Foott / Pika (Ochotona princeps) carrying Hay Pile, in Bridger National Forest, Wyoming Mountain Range, Wyoming, USA, July.
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Jeff Foott / Pika (Ochotona princeps) in Bridger National Forest, Wyoming Mountain Range, Wyoming, USA, July.
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Jeff Foott / Pika (Ochotona princeps) in Bridger National Forest, Wyoming Mountain Range, Wyoming, USA, July.
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Jeff Foott / Pika (Ochotona princeps) in Bridger National Forest, Wyoming Mountain Range, Wyoming, USA, July.
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Jeff Foott / Pika (Ochotona princeps) yawning.Bridger National Forest, Wyoming Mountain Range, Wyoming, USA, June.
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Danny Green / Pika (Ochotona princeps) resting, Denali National Park, Alaska, USA, September
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Jeff Foott / Pika (Ochotona princeps) gathering plants to store for winter, Bridger National Forest, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) gathering plants to store for winter, Bridger National Forest, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) gathering plants to store for winter, Bridger National Forest, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) gathering plants to store for winter, Bridger National Forest, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) gathering plants to store for winter, Bridger National Forest, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) in Bridger National Forest, Wyoming, USA, July.
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Jeff Foott / Pika (Ochotona princeps) in Bridger National Forest, Wyoming, USA. June.
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Jeff Foott / Pika (Ochotona princeps) on hay pile, in Bridger National Forest, Wyoming, USA. June.
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Jeff Foott / Pika (Ochotona princeps) gathering plants to store for winter, Bridger National Forest, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) on hay pile, in Bridger National Forest, Wyoming, USA. July.
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Jeff Foott / Pika (Ochotona princeps) at hay pile, in Bridger National Forest, Wyoming, USA. July.
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Jeff Foott / Pika (Ochotona princeps) grooming, Bridger National Forest, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) in Bridger National Forest, Wyoming Mountain Range, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) gathering plants to store for winter, Bridger National Forest, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) in Bridger National Forest, Wyoming Mountain Range, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) in Bridger National Forest, Wyoming Mountain Range, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) bringing vegetation to hay pile, in Bridger National Forest, Wyoming, USA, August.
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Jeff Foott / Pika (Ochotona princeps) gathering plants to store for winter, Bridger National Forest, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) gathering plants to store for winter, Bridger National Forest, Wyoming, USA. August.
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Jeff Foott / Pika (Ochotona princeps) on hay pile, in Bridger National Forest, Wyoming, USA. August.
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Mary McDonald / Pika (Ochotona princeps) nest in scree rock pile, Sheepeaters Cliff, Yellowstone National Park, Wyoming, USA, September.
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Mary McDonald / Pika (Ochotona princeps) gathering nest material, in scree rock pile, Sheepeaters Cliff, Yellowstone National Park, Wyoming, USA, September.
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Mary McDonald / Pika (Ochotona princeps) in scree rock pile, Sheepeaters Cliff, Yellowstone National Park, Wyoming, USA, September.
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Joel Sartore / Photo Ark / American pika (Ochotona princeps) portrait, Niwot Ridge Field Station, Colorado, USA. Captive.
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Joel Sartore / Photo Ark / American pika (Ochotona princeps) portrait, Niwot Ridge Field Station, Colorado, USA. Captive.
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Joel Sartore / Photo Ark / American pika (Ochotona princeps) portrait, Niwot Ridge Field Station, Colorado, USA. Captive.
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Jeff Foott / Pika (Ochotona princeps) sitting on a rock, Bridger National Forest, Wyoming Mountain Range, Wyoming, USA. Due to the warming climate, pikas have had to move to higher, cooler elevations in order to...
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Jeff Foott / Pika, (Ochotona princeps), carrying vegetation to add to its hay pile, Bridger National Forest, Wyoming Mountain Range, Wyoming, USA. Due to the warming climate, pikas have had to move to higher, co...
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Jeff Foott / Pika, (Ochotona princeps), adding vegetation to its hay pile, Teton National Park, Wyoming, USA. Due to the warming climate, pikas have had to move to higher, cooler elevations in order to survive. S...
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Jeff Foott / Pika, (Ochotona princeps), carrying vegetation to add to its hay pile, Bridger National Forest, Wyoming Mountain Range, Wyoming, USA. Due to the warming climate, pikas have had to move to higher, coo...
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Jeff Foott / Pika, (Ochotona princeps), carrying vegetation to add to its hay pile, Bridger National Forest, Wyoming Mountain Range, Wyoming, USA. Due to the warming climate, pikas have had to move to higher, coo...
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Jeff Foott / Large hay pile of a Pika (Ochotona princeps), Bridger National Forest, Wyoming Mountain Range, Wyoming, USA. Due to the warming climate, pikas have had to move to higher, cooler elevations in order t...
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Joel Sartore / Photo Ark / American pika (Ochotona princeps) profile chewing, Niwot Ridge LTER, Colorado. Controlled Conditions.
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Joel Sartore / Photo Ark / American pika (Ochotona princeps) looking around, Niwot Ridge LTER, Colorado. Controlled Conditions.
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George Sanker / American pika (Ochotona princeps). Yellowstone National Park, Wyoming, USA.
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Charlie Summers / American pika (Ochotona princeps) feeding on orange peel discarded by visitor, Rocky Mountain National Park, Colorado, USA. September.