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Grizzly bear (Ursus arctos horribilis), Glacier National Park, Montana, United States of America, North America

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

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

Female lark bunting (Calamospiza melanocorys), 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), Pawnee National Grassland, Colorado, United States of America, North America

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

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

Loggerhead shrike (Lanius ludovicianus), 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) 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

White-tailed ptarmigan (Lagopus leucurus) in summer plumage, San Juan National Forest, Colorado, United States of America, North America

Dusky grouse (blue grouse) (Dendragapus obscurus) hen, Glacier National Park, Montana, 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

Yellow-headed blackbird (Xanthocephalus xanthocephalus), Yellowstone National Park, Wyoming, United States of America, North America

Zodiac near Type D (sub-Antarctic) killer whale (Orcinus orca), in the Drake Passage, Antarctica, Polar Regions

A young Type D (sub-Antarctic) killer whale (Orcinus orca), surfacing in the Drake Passage, Antarctica, Polar Regions

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

A Panamanian white-faced capuchin, Cebus imitator, in Manuel Antonio National Park, Costa Rica, Central America

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

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

Eastern grey kangaroo (Macropus giganteus) mother with a baby joey in her pouch in the Blue Mountains Area, New South Wales, Australia, Pacific

Koala Bear (Phascolarctos cinereus) at Port Macquarie Koala Bear Hospital, New South Wales, Australia, Pacific

Sulphur-crested cockatoo (Cacatua galerita) in Sydney Botanic Gardens,Sydney, New South Wales, Australia, Pacific

Koala Bear (Phascolarctos cinereus) at Port Macquarie Koala Bear Hospital, New South Wales, Australia, Pacific

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

Leatherback turtle (Dermochelys coriacea) eggs being collected for transfer to a safer hatchery location, Shell Beach, Guyana, South America

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

Sally lightfoot crab (Grapsus grapsus), Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

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 shearwater (Puffinus subalaris), Punta Pitt, San Cristobal 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

Laguna Colorada (Red Lagoon), a shallow salt lake in the southwest of the altiplano, Eduardo Avaroa Andean Fauna National Reserve, Bolivia, South America

Flamingos on Laguna Colorada (Red Lagoon), Eduardo Avaroa Andean Fauna National Reserve, Southwest Highlands, Bolivia, South America

Laguna Colorada (Red Lagoon), a shallow salt lake in the southwest of the altiplano, within Eduardo Avaroa Andean Fauna National Reserve, Bolivia, South America

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

Two Rockhopper penguins (Eudyptes chrysocome chrysocome) showing affection, Sea Lion Island, Falkland Islands, South America

American pika (Ochotona princeps), Shoshone National Forest, Wyoming, United States of America, North America

Badger (Taxidea taxus), Buffalo Gap National Grassland, Conata Basin, South Dakota, United States of America, North America

Black-footed ferret (American polecat) (Mustela nigripes), Buffalo Gap National Grassland, Conata Basin, South Dakota, United States of America, North America

Two bighorn sheep (Ovis canadensis) rams head butting, Clear Creek County, Colorado, United States of America, North America

Bison (Bison bison) bull and cow, Yellowstone National Park, Wyoming, United States of America, North America

Yellow-eyed penguin (Megadyptes antipodes), Katiki Point, Moeraki Penninsula, Otago, South Island, New Zealand, Pacific

Blacktail prairie dog (Cynomys ludovicianus) feeding, Theodore Roosevelt National Park, North Dakota, United States of America, North America

American pika (Ochotona princeps), Peter Lougheed Provincial Park, Kananaskis Country, Alberta, Canada, North America

Two bighorn sheep (Ovis canadensis) rams head butting, Clear Creek County, Colorado, United States of America, North America

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

Mountain goat (Oreamnos americanus) nanny and kid in the spring, Shoshone National Forest, Wyoming, United States of America, North America

Leatherback turtle (Dermochelys coriacea) laying eggs under the watchful eyes of a conservation worker, Shell Beach, Guyana, South America

Male Guianan Cock of the Rock (Rupicola rupicola) in its dense forest habitat, Kaieteur National Park, Guyana, South America

Golden Rocket Frog (Anomaloglossus beebei) guarding spawn in Giant Tank Bromeliad (Brocchinia micrantha), Kaieteur National Park, Guyana, South America

Golden Rocket Frog (Anomaloglossus beebei) on giant tank bromeliad (Brocchinia micrantha) leaf, Kaieteur National Park, Guyana, South America

Researchers measuring a female Leatherback turtle (Dermochelys coriacea) at its nest site, Shell Beach, Guyana, South America

Turtle warden with nesting Leatherback turtle (Dermochelys coriacea), Shell Beach, Guyana, South America

Spawn of the Golden Rocket Frog (Anomaloglossus beebei) in giant tank bromeliad (Brocchinia micrantha), Kaieteur National Park, Guyana, South America

Leatherback turtle (Dermochelys coriacea) eggs being collected for transfer to a safer hatchery location, Shell Beach, Guyana, South America

Golden Rocket Frog (Anomaloglossus beebei) on giant tank Bromeliad (Brocchinia micrantha), Kaieteur National Park, Guyana, South America

Puffin (Fratercula arctica) hanging onto the rock on a summer's evening on the Saltees Islands, County Wexford, Leinster, Republic of Ireland, Europe

An adult brown skua (Stercorarius spp) stealing a penguin egg at Brown Bluff, Antarctica, Polar Regions

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