Jeff Foott / Pronghorn Antelope (Antilocapra americana) male in grassland, Wind Cave National Park, South Dakota
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Tim Fitzharris / Grassland and cumulus clouds, Wind Cave National Park, South Dakota
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Jim Brandenburg / Ponderosa Pine (Pinus ponderosa) tree on prairie, Wind Cave National Park, South Dakota
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Jim Brandenburg / Black-tailed Prairie Dog (Cynomys ludovicianus) barking while standing on its hind feet and raising the head back, a behavior known as jump-yip calling, Wind Cave National Park, South Dakota
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Jim Brandenburg / Black-tailed Prairie Dog (Cynomys ludovicianus) in burrow with American Bison (Bison bison) and Ponderosa Pines (Pinus ponderosa), Wind Cave National Park, South Dakota
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Jim Brandenburg / Cloudy sky over tallgrass prairie, Wind Cave National Park, South Dakota
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Sean Crane / Black-tailed Prairie Dog (Cynomys ludovicianus) pair greeting, Wind Cave National Park, South Dakota
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Jeff Foott / Black-tailed Prairie Dog (Cynomys ludovicianus) mother and young, Wind Cave National Park, South Dakota
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Jeff Foott / Black-tailed Prairie Dog (Cynomys ludovicianus) in burrow, Wind Cave National Park, South Dakota
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Jeff Foott / Black-tailed Prairie Dog (Cynomys ludovicianus), Wind Cave National Park, South Dakota
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Jeff Foott / Black-tailed Prairie Dog (Cynomys ludovicianus) in territorial display, Wind Cave National Park, South Dakota
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Jeff Foott / Black-tailed Prairie Dog (Cynomys ludovicianus) at burrow, Wind Cave National Park, South Dakota
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Espen Bergersen / Adult male King eider (Somateria spectabilis) portrait, Batsfjord, Norway, March.
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Nick Garbutt / Male Bare-faced Curassow (Crax fasciolata) near Araras Lodge, Mato Grosso, Northern Pantanal, Brazil, South America.
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Cyril Ruoso / American fur seal (Arctocephalus australis) hauled out on the shore, with flock of Guanay cormorant (Phalacrocorax bougainvilli) Punta Coles Reserve, Peru, December.
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Solvin Zankl / King penguins (Aptenodytes patagonicus) colony, Antarctica
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Danny Green / Willow Grouse (Lagopus lagopus) male perched on snow, Finland, March. Bookplate from Danny Green's 'The Long Journey North'
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Staffan Widstrand / RF- Portrait of Giant tortoise (Geochelone elephantopus). Galapagos National Park, Ecuador. (This image may be licensed either as rights managed or royalty free.)
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Guy Edwardes / Black-backed Jackal (Canis mesomelas) sitting, portrait. Savuti, Chobe National Park, Botswana.
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Guy Edwardes / Black-backed jackal (Canis mesomelas) sniffing air whilst sitting. Savuti, Chobe National Park, Botswana.
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Nick Garbutt / RF - Walrus (Odobenus rosmarus) hauled out on shore, portrait. Northern Spitsbergen, Svalbard, Norway. July. (This image may be licensed either as rights managed or royalty free.)