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Thirteen-lined ground squirrel (Citellus tridecemlineatus) feeding, Pawnee National Grassland, Colorado, United States of America, North America

American pika (Ochotona princeps) calling, San Juan National Forest, Colorado, United States of America, North America

Swift fox (Vulpes velox) vixen and three kits at their den, Pawnee National Grassland, Colorado, United States of America, North America

Swift fox (Vulpes velox) vixen nursing three kits, Pawnee National Grassland, Colorado, United States of America, North America

Mountain goat (Oreamnos americanus) nanny and kid, Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

Swift fox (Vulpes velox) kit, Pawnee National Grassland, Colorado, United States of America, North America

Swift fox (Vulpes velox), Pawnee National Grassland, Colorado, United States of America, North America

Yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris), Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

Swift fox (Vulpes velox) vixen at her den, Pawnee National Grassland, Colorado, United States of America, North America

Swift fox (Vulpes velox), Pawnee National Grassland, Colorado, United States of America, North America

Swift fox (Vulpes velox) vixen and three kits at their den, Pawnee National Grassland, Colorado, United States of America, North America

Swift fox (Vulpes velox), Pawnee National Grassland, Colorado, United States of America, North America

Swift fox (Vulpes velox) vixen grooming a kit, Pawnee National Grassland, Colorado, United States of America, North America

Swift fox (Vulpes velox) vixen grooming a kit, Pawnee National Grassland, Colorado, United States of America, North America

Close-up of a macaroni penguin (Eudyptes chrysolophus), East Falkland, Falkland Islands, South America

Australian eastern water dragon (Physignathus lesueurii) in Brisbane Botanical Gardens, Brisbane, Queensland, Australia, Pacific

Swallow-tailed gull (Creagrus furcatus), Genovesa Island, Galapagos Islands, UNESCO World Heritge Site, Ecuador, South America

Galapagos marine iguana (Amblyrhynchus cristatus), Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lions (Zalophus wollebaeki), Gardner beach, Santiago Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Blue-footed booby (Sula nebouxii), Cormorant Point, Floreana Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Greater flamingo (Phoenicopterus ruber), Cerro Dragon, Santa Cruz Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Guardabarranco (turquoise-browed motmot), national bird of Nicaragua, on the slopes of Telica volcano, Leon, Nicaragua, Central America

Wild horse (Equus Caballus) stallion, Theodore Roosevelt National Park, North Dakota, United States of America, North America

Adult bull Atlantic walrus (Odobenus rosmarus rosmarus) on the beach in Torellneset, Nordauslandet, Svalbard, Norway, Scandinavia, Europe

Banded mongoose (Mungos mungo) drinking, Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

Hippopotamus (Hippopotamus amphibius) flipping water with its ear, Kruger National Park, South Africa, Africa

A lone reindeer (Rangifer tarandus) grazing on the tundra in Russebukta, Edgeoya, Norway, Scandinavia, Europe

Golden damsel fish (Amblyglyphidodon aureus) in a coral encrusted bottle, Sulawesi, Indonesia, Southeast Asia, Asia

Mimic filefish (Paraluteres prionurus) minics black saddled toby, Sulawesi, Indonesia, Southeast Asia, Asia

Steep cliffs filled with nesting birds on the south side of Bjornoya (Bear Island), Svalbard, Norway, Scandinavia, Europe

Snow storm approaching Alkefjelet, Cape Fanshawe, Spitsbergen, Svalbard, Norway, Scandinavia, Europe

Adult bull Atlantic walrus (Odobenus rosmarus rosmarus) rolling on its back on ice in Storfjorden, Svalbard, Norway, Scandinavia, Europe

Snow storm approaching Alkefjelet, Cape Fanshawe, Spitsbergen, Svalbard, Norway, Scandinavia, Europe

Steep cliffs filled with nesting birds on the south side of Bjornoya (Bear Island), Svalbard, Norway, Scandinavia, Europe

American Bison (Bison bison), Grand Teton National Park, Wyoming, United States of America, North America

American Bison (Bison bison), Grand Teton National Park, Wyoming, United States of America, North America

Bison (Bison bison) bull covered with frost in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Southwestern Myotis (Myotis auriculus) in flight about to take a drink, Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

Female broad-tailed hummingbird (Selasphorus platycercus) feeding at a Walkingstick Cholla (Cane Cholla) (Opuntia spinosior), Arizona, United States of America, North America

Female broad-tailed hummingbird (Selasphorus platycercus) feeding at a Walkingstick Cholla (Cane Cholla) (Opuntia spinosior), Arizona, United States of America, North America

Southwestern Myotis (Myotis auriculus) in flight after taking a drink, Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

Black bear (Ursus americanus) sow and cub of the year, Yellowstone National Park, Wyoming, United States of America, North America

White-nosed coati (Nasua narica) in a tree, Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

Exmoor ponies graze on heather covered moorland on Porlock Common in summer, Exmoor, Somerset, England, United Kingdom, Europe

Bison (Bison bison) cow and calf in the spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Swift fox (Vulpes velox) adults and two kits, Pawnee National Grassland, Colorado, United States of America, North America

Swift fox (Vulpes velox) adult and two kits, Pawnee National Grassland, Colorado, United States of America, North America

Yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris) carrying a pup, Yellowstone National Park, Wyoming, United States of America, North America

Swift fox (Vulpes velox) nursing, Pawnee National Grassland, Colorado, United States of America, North America

Wied's marmoset (Wied's black-tufted-ear marmoset) (Callithrix kuhlii), Bahia, Brazil, South America

Black bear (Ursus americanus) in a spring snow storm, Yellowstone National Park, Wyoming, United States of America, North America

Yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris) in its Alpine environment, San Juan National Forest, Colorado, United States of America, North America

Young yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris) prairie-dogging, San Juan National Forest, Colorado, United States of America, North America

Swift fox (Vulpes velox) kits playing, Pawnee National Grassland, Colorado, United States of America, North America

Sunrise behind rosy paintbrush (split-leaf Indian paintbrush) (spliteaf Indian paintbrush) (Castilleja rhexifolia) and Alpine avens (Ross's avens) (Acomastylis rossii turbinata), San Juan National Forest, Colorado, United States of America, North America

Bison (Bison bison) bull in a spring snowstorm, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Swift fox (Vulpes velox), Pawnee National Grassland, Colorado, United States of America, North America

Yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris) young and adult, San Juan National Forest, Colorado, United States of America, North America

Uinta chipmunk (Tamias umbrinus), Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) cow and calf in the spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Swift fox (Vulpes velox) leaping, Pawnee National Grassland, Colorado, United States of America, North America

Young mule deer (Odocoileus hemionus) in a snow storm in the spring, Yellowstone National Park, Wyoming, United States of America, North America

Young yellow-bellied marmot) (yellowbelly marmot) (Marmota flaviventris) sitting up, San Juan National Forest, Colorado, United States of America, North America

Swift fox (Vulpes velox) vixen and kits, Pawnee National Grassland, Colorado, United States of America, North America

Bison (Bison bison) bull in the spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Rarely seen Striped possum (Dactylopsila trivirgata) on tree in the Wet Tropic rainforest of Queensland, Australia, Pacific