Ingo Arndt / Olive ridley sea turtles (Lepidochelys olivacea) digging their nests by night with stars during an arribada (mass nesting event) to lay eggs, Pacific Coast, Ostional, Costa Rica.
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Ingo Arndt / Olive ridley sea turtles (Lepidochelys olivacea) females coming ashore at twilight during an arribada (mass nesting event) to lay eggs, Pacific Coast, Ostional, Costa Rica.
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Ingo Arndt / Olive ridley sea turtles (Lepidochelys olivacea) females coming ashore during an arribada (mass nesting event) to lay eggs, Pacific Coast, Ostional, Costa Rica.
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Loic Poidevin / Red cracker butterfly (Hamadryas amphinome) captive occurs in the Americas.
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Peter Cairns / American bison (Bison bison) walking through snow using tracks made by other animals, Yellowstone National Park, Wyoming, USA, February.
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Peter Cairns / Tourists watching American bison (Bison bison) Yellowstone National Park, Wyoming, USA, February 2013.
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Peter Cairns / American Bison (Bison bison) walking through deep snow, Yellowstone National Park, Wyoming, USA, February.
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Peter Cairns / Calcified trees at Tangled Creek in winter, Yellowstone National Park, Wyoming, USA, February 2013.
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Peter Cairns / Calcified trees at Tangled Creek in winter, Yellowstone National Park, Wyoming, USA, February 2013.
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Peter Cairns / Wood patterns in Lodgepole pine (Pinus contorta) Yellowstone National Park, Wyoming, USA, January.
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Peter Cairns / American Bison (Bison bison) walking through snow field, Hayden Valley,Yellowstone National Park, Wyoming, USA, January.
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Peter Cairns / American Bison (Bison bison) lying in snow field, Hayden Valley,Yellowstone National Park, Wyoming, USA, January.
