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Hippopotamus (Hippopotamus amphibius) mother and calf, Serengeti National Park, Tanzania, East Africa, Africa

Rosy-breasted longclaw (pink-throated longclaw) (Macronyx ameliae) singing, Ngorongoro Crater, Tanzania, East Africa, Africa

Black bear (Ursus americanus) cub of the year or spring cub in a tree, Yellowstone National Park, Wyoming, United States of America, North America

Bighorn sheep (Ovis canadensis) ram eating in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Wilson Peak in the winter, Uncompahgre National Forest, Colorado, United States of America, North America

Three bare trees on a hazy morning, Badlands National Park, South Dakota, United States of America, North America

Red Fox (Vulpes vulpes) (Vulpes fulva) in the snow, Grand Teton National Park, Wyoming, United States of America, North America

Red leaves on a big tooth maple branch in the fall, Zion National Park, Utah, United States of America, North America

Colorado side-blotched lizard (Uta stansburiana uniformis), Canyon Country, Utah, United States of America, North America

Mountain lion (cougar) (Felis concolor) in captivity, Arizona Sonora Desert Museum, Tucson, Arizona, United States of America, North America

Bobcat (Lynx rufus) in the snow in captivity, near Bozeman, Montana, United States of America, North America

Male house sparrow (Passer domesticus) feeding a chick, near Saanich, British Columbia, Canada, North America

Stone sheep (Ovis dalli stonei) lamb, Muncho Lake Provincial Park, British Columbia, Canada, North America

Wild turkey (Meleagris gallopavo), Custer State Park, South Dakota, United States of America, North America

Red and white sandstone formations under clouds, White Pocket, Vermillion Cliffs National Monument, Arizona, United States of America, North America

Bison (Bison bison) cow and calf drinking from a pond, Custer State Park, South Dakota, United States of America, North America

Cave Myotis (Myotis velifer) in flight in captivity, Hidalgo County, New Mexico, United States of America, North America

Female mountain bluebird (Sialia currucoides) with an insect, Yellowstone National Park, Wyoming, United States of America, North America

Black rhinoceros (hook-lipped rhinoceros) (Diceros bicornis), Ngorongoro Crater, Tanzania, East Africa, Africa

Egyptian goose (Alopochen aegyptiacus) adults and chicks, Serengeti National Park, Tanzania, East Africa, Africa

Field of yellow dryad (yellow mountain-avens) (Dryas drummondii) in the seed-pod stage, Jasper National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, North America

Bison (Bison bison) bull demonstrating the flehmen response, Yellowstone National Park, Wyoming, United States of America, North America

Cape mountain zebra (Equus zebra zebra) sparring, Mountain Zebra National Park, South Africa, Africa

Three red-billed quelea (Quelea quelea), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Male mountain bluebird (Sialia currucoides), Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

Rosy paintbrush (split-leaf Indian paintbrush) (spliteaf Indian paintbrush) (Castilleja rhexifolia), San Juan National Forest, Colorado, United States of America, North America

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

River Otter (Lutra canadensis) on frozen Yellowstone Lake, Yellowstone National Park, Wyoming, United States of America, North America

Alpine waterfall with wildflowers at sunset, San Juan National Forest, Colorado, United States of America, North America

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

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

Springbok (Antidorcas marsupialis) among orange wildflowers (Namaqualand daisies) and (glossy-eyed mountain daisies), Namaqualand, South Africa, Africa

Young Masai giraffe (Giraffa camelopardalis tippelskirchi), Selous Game Reserve, Tanzania, East Africa, Africa

Crested barbet (Trachyphonus vaillantii) with a raised crest, Selous Game Reserve, Tanzania, East Africa, Africa

Southern ground-hornbill (ground hornbill) (Bucorvus leadbeateri), Selous Game Reserve, Tanzania, East Africa, Africa

Grey crowned crane (Southern crowned crane) (Balearica regulorum), Ngorongoro Crater, Tanzania, East Africa, Africa

Coyote (Canis latrans) in the snow in winter, Yellowstone National Park, Wyoming, United States of America, North America

Swallow-tailed bee-eater (Merops hirundineus) adult and juvenile, Kgalagadi Transfrontier Park, South Africa, Africa

African Elephant (Loxodonta africana) mother and young, Addo Elephant National Park, South Africa, Africa

Opossum (Didelphis virginiana) mother and babies, in captivity, Sandstone, Minnesota, United States of America, North America

Gray wolf (Canis lupus) mother and pup, in captivity, Bozeman, Montana, United States of America, North America

Cape fox (Vulpes chama) pups playing, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Sunset at Crater Lake with Wizard Island, Crater Lake National Park, Oregon, United States of America, North America

Lion (Panthera leo) and Masai giraffe (Giraffa camelopardalis tippelskirchi) looking at each other, Masai Mara National Reserve, Kenya, East Africa, Africa

Female Barrow's Goldeneye (Bucephala islandica), Yellowstone National Park, Wyoming, United States of America, North America

Bull moose (Alces alces), Roosevelt National Forest, Colorado, United States of America, North America

Red-Billed Oxpecker (Buphagus erythrorhynchus) on a Grants Zebra (Plains Zebra) (Common Zebra) (Equus burchelli boehmi), Masai Mara National Reserve, Kenya, East Africa, Africa

Red hartebeest (Alcelaphus buselaphus), Kgalagadi Transfrontier Park, former Kalahari Gemsbok National Park, South Africa

Infant Chacma baboon (Papio ursinus) riding on its mother's back, Kruger National Park, South Africa, Africa

African elephant (Loxodonta africana) mother showering, Addo Elephant National Park, South Africa, Africa

Two cheetah (Acinonyx jubatus), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Two young lion (Panthera leo) playing, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Blesbok (Damaliscus pygargus phillipsi) lamb leaping, Mountain Zebra National Park, South Africa, Africa

Female Cape sparrow (Passer melanurus), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Two young lion (Panthera leo) playing, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Black wildebeest (white-tailed gnu) (Connochaetes gnou) running, Mountain Zebra National Park, South Africa, Africa

Southern Ground-Hornbill or Ground Hornbill (Bucorvus leadbeateri) adult, Serengeti National Park, Tanzania

Black rhinoceros (hook-lipped rhinoceros) (Diceros bicornis), Ngorongoro Crater, Tanzania, East Africa, Africa

Bull elk (Cervus canadensis) feeding in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Wilson Peak with a dusting of snow in the fall, San Juan National Forest, Colorado, United States of America, North America

Bull moose (Alces alces) in velvet, Roosevelt National Forest, Colorado, United States of America, North America

Pronghorn (Antilocapra americana) doe, Custer State Park, South Dakota, United States of America, North America

Box elder (boxelder maple) (maple ash) (Acer negundo) branch with yellow leaves in the fall, Capitol Reef National Park, Utah, United States of America, North America

Sharp-tailed grouse (Tympanuchus phasianellus) (previously Tetrao phasianellus), Custer State Park, South Dakota, United States of America, North America

Mount Hayden at dusk from Point Imperial, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Red and orange maples and yellow aspens in the fall, Wasatch Mountain State Park, Utah, United States of America, North America