1116-51726 - Male Gambel's Quail (Callipepla gamibelli) walking through dry yellow grass; Casa Grande, Arizona, United States of America

1116-51724 - Bobcat (Lynx rufus) with front paw raised walks along a path at Sweetwater Wetlands; Tucson, Arizona, United States of America

1116-51225 - Striped Skunk (Mephitis mephitis) at Cave Creek Ranch in the Chiricahua Mountains near Portal; Arizona, United States of America

1116-51443 - Falling snow clings to an American Bison bull (Bison bison) standing in a meadow in the North Fork of the Shoshone River valley near Yellowstone National Park; Wyoming, United States of America

1116-51444 - American Bison bull (Bison bison) on a snowy day in the North Fork of the Shoshone River valley near Yellowstone National Park; Wyoming, United States of America

1116-51436 - Coyote (Canis latrans) leaps in the air while hunting mice in Yellowstone National Park; Wyoming, United States of America

1116-51441 - Coyote (Canis latrans) standing in deep snow in Yellowstone National Park; Wyoming, United States of America

1116-51438 - Bighorn Sheep ram (Ovis canadensis) performs lip curl (flehmen display) in the North Fork of the Shoshone River valley near Yellowstone National Park; Wyoming, United States of America

1116-51440 - Lone Coyote (Canis latrans) stands and howls in wintry landscape of Yellowstone National Park; Wyoming, United States of America

1116-51435 - Coyote (Canis latrans) with a freshly captured vole in its mouth in Yellowstone National Park; Wyoming, United States of America

1116-51224 - Female Javalina, or Collared Peccary (Pecari tajacu), with young foraging for acorns at Cave Creek Ranch in the Chiricahua Mountains near Portal; Arizona, United States of America

1116-51223 - Male Pyrrhuloxia (Cardinalis sinuatus) perched on a dead branch in the foothills of the Chiricahua Mountains near Portal; Arizona, United States of America

1116-51727 - Male Gambel's Quail (Callipepla gamibelli) showing two head plumes searching for food on ground; Casa Grande, Arizona, United States of America

1116-51729 - Four Black-tailed Jackrabbits (Lupus californicus) lined up single file with the leader raised on its hind legs in an open field; Casa Grande, Arizona, United States of America

1116-51442 - Coyote (Canis latrans) plows through deep snow while hunting mice in Yellowstone National Park; Wyoming, United States of America

1116-51434 - Coyote (Canis latrans) leaps in the air while hunting mice in Yellowstone National Park; Wyoming, United States of America

1116-51437 - Bighorn Sheep ram (Ovis canadensis) courts a pair of ewes during the rut in the North Fork of the Shoshone River valley near Yellowstone National Park; Wyoming, United States of America

1116-51730 - Backlit Black-tailed Jackrabbit (Lupus californicus) with sunlight shining through its ears; Casa Grande, Arizona, United States of America

1116-51728 - Two Round-tailed Ground Squirrel pups (Xerospermophilus tereticadus) at their burrow entrance; Casa Grande, Arizona, United States of America

1116-51725 - Pond Slider turtle (Trachemys scripta) sunning on a submerged log and showing its reflection in a pond at the Riparian Preserve at Water Ranch; Gilbert, Arizona, United States of America

1116-51439 - Bighorn Sheep ram (Ovis canadensis) approaches through a sagebrush meadow on a snowy day in the North Fork of the Shoshone River valley near Yellowstone National Park; Wyoming, United States of America

1116-49169 - African Elephant (Loxodonta africana) cow and calf kicking up dust while walking through grassy plains, backlit by setting sun, Katavi National Park, Tanzania

1116-49407 - Two Burrowing Owls (Athene cunicularia), perched side by side near entrance to their burrow, Casa Grande, Arizona, United States of America

1116-49409 - Burrowing Owl (Athene cunicularia) perched on the ground with head turned to look backwards, Casa Grande, Arizona, United States of America

1116-49182 - African Elephant (Loxodonta africana) with raised trunk and ears spread wide in Ruaha National Park, Tanzania

1116-49408 - Four Burrowing Owls (Athene cunicularia), peering from the entrance to their burrow, Casa Grande, Arizona, United States of America

1116-49166 - Large herd of Wildebeest (Connochaetes taurinus) kick up dust as they plunge down a steep bank to cross the Mara River, Serengeti National Park, Tanzania

1116-49180 - Group of Hippopotamus (Hippopotamus amphibious, ) with Red-billed Oxpeckers (Buphagus erythrorhynchus) lie on sandy river bank in Katavi National Park, Tanzania

1116-49157 - Sun sets behind a tree in Ruaha National Park, Tanzania

1116-49158 - Sun setting behind lone acacia tree on the edge of the Katavi Plain in Katavi National Park, Tanzania

1116-49162 - Herd of Wildebeest (Connochaetes taurinus) crossing the Mara River and climbing out on the far bank in Serengeti National Park, Tanzania

1116-49171 - Female Chimpanzees (Pan troglodytes) grooming each other while one of their babies sits between them in Mahale Mountains National Park on the shores of Lake Tanganyika, Tanzania

1116-49170 - Sun setting behind boat moored to dock at Mbali Mbali Mahale Lodge (Kungue Beach Lodge) on Lake Tanganyika, Tanzania

1116-49183 - Leopard (Panthera pardus) peers from behind a lichen-covered rock in Ruaha National Park, Tanzania

1116-49178 - Wildebeest (Connochaetes taurinus) crowd together as they run along the shore of the Mara River looking for a place to cross, Serengeti National Park, Tanzania

1116-49175 - Black-and-white Colobus Monkey (Colobus guereza) sitting in a tree at Ngare Sero Mountain Lodge, near Arusha, Tanzania

1116-49179 - Close-up portrait of lioness (Panthera Leo), Katavi National Park, Tanzania

1116-49410 - Pair of Burrowing Owls (Athene cunicularia) perched on Cholla cactus (Cylindropuntia) skeleton, Casa Grande, Arizona, United States of America

1116-49181 - Two Hippopotamus (Hippopotamus amphibious) face off aggressively in shallow water in Katavi National Park, Tanzania

1116-49174 - Female Chimpanzee (Pan troglodytes) and a tiny baby in Mahale Mountains National Park on the shores of Lake Tanganyika, Tanzania

1116-49168 - Hippopotamus (Hippopotamus amphibious) standing ankle-deep in shallow water in Katavi National Park, Tanzania

1116-49165 - Large herd of Wildebeest (Connochaetes taurinus) kick up dust as they descend a steep bank to cross the Mara River, Serengeti National Park, Tanzania

1116-49411 - Burrowing Owl (Athene cunicularia) perched on the ground, Casa Grande, Arizona, United States of America

1116-49167 - Safari vehicle drives toward the rising sun shining through the branches of a leafless tree in Katavi National Park, Tanzania

1116-49160 - Female Leopard (Panthera pardus) surveys its territory from atop a large boulder in Serengeti National Park, Tanzania

1116-49156 - Young Chimpanzee (Pan troglodytes) resting in a tree in Mahale Mountains National Park on the shore of Lake Tanganika, Tanzania

1116-49164 - Large herd of Wildebeest (Connochaetes taurinus) kick up dust as they plunge down a steep bank to cross the Mara River, Serengeti National Park, Tanzania

1116-49161 - African Elephant (Loxodonta africana) with partial reflection drinks from a quiet pool in the Ruaha River in Ruaha National Park, Tanzania

1116-49176 - Wildebeest (Connochaetes taurinus) splash through the Mara River, Serengeti National Park, Tanzania

1116-49177 - Large herd of Wildebeest (Connochaetes taurinus) kick up dust as they plunge down a steep bank to cross the Mara River, Serengeti National Park, Tanzania

1116-49185 - A lone acacia tree on the edge of the Katavi Plain in Katavi National Park, Tanzania

1116-49184 - Adult Maasai Giraffe (Giraffa camelopardalis) with three young Giraffes in the golden dry savannah of Ruaha National Park, Tanzania

1116-49172 - Female Chimpanzee (Pan troglodytes) lying on its back with baby in arms is groomed by another female in Mahale Mountains National Park on the shores of Lake Tanganyika, Tanzania

1116-49163 - Dense herd of Wildebeest (Connochaetes taurinus) in the dry grasslands of the Serengeti Plains, Serengeti National Park, Tanzania

1116-49159 - Sun setting behind lone acacia tree on the edge of the Katavi Plain in Katavi National Park, Tanzania

1116-49173 - Female Chimpanzee (Pan troglodytes) lying on her back cradles her baby while another female Chimpanzee looks on in Mahale Mountains National Park on the shores of Lake Tanganyika, Tanzania

1116-50348 - Coyote (Canis latrans) trudging through deep snow in Yellowstone National Park; Wyoming United States of America

1116-50347 - American Bison (Bison bison) grazing in a snowy meadow beneath majestic mountain peaks in Yellowstone National Park; Wyoming, United States of America

1116-50352 - American Marten (Martes americana) sits on snowbank beneath conifer branches; Silver Gate, Montana, United States of America

1116-50351 - American Bison bull (Bison bison) plowing through deep snow in the Firehole River Valley, Yellowstone National Park; Wyoming, United States of America

1116-50349 - Coyote (Canis latrans) trotting across a snowy meadow on a sunny winter day in Yellowstone National Park; Wyoming United States of America

1116-50353 - Large bull Elk (Cervus canadensis) with majestic antlers standing in winter snowstorm in Yellowstone National Park; Wyoming, United States of America

1116-50350 - American Bison bull (Bison bison) walking through winter snow in the Lamar Valley, Yellowstone National Park; Wyoming, United States of America

1116-50346 - Pair of American Bison bulls (Bison bison) walking through the 'Bobby Socks' trees in the Firehole River Valley of Yellowstone National Park; Wyoming, United States of America

1116-47257 - Yellow-billed Stork (Mycteria ibis) in flight in a blue sky at Lake Manyara National Park, Tanzania

1116-47258 - African elephants (Loxodonta africana) tower over grazing Wildebeests (Connochaetes taurinus) in Serengeti National Park, Tanzania

1116-47264 - Leopard (Panthera pardus) crouching in tree in the Ndutu area of the Ngorongoro Crater Conservation Area on the Serengeti Plains, Tanzania

1116-47252 - Female Cheetah (Acinonyx jubatus) drags freshly killed Thomson's Gazelle (Eudorcas thomsonii) in the Ndutu area of the Ngorongoro Conservation Area on the Serengeti Plains, Tanzania

1116-47246 - Pair of Lappet-faced (or Nubian) vultures (Torgos tracheliotos) perched on ground looking over their shoulders in the Ndutu area of the Ngorongoro Crater Conservation Area on the Serengeti Plains, Tanzania

1116-47266 - Leopard (Panthera pardus) resting in tree in the Ndutu area of the Ngorongoro Crater Conservation Area on the Serengeti Plains, Tanzania

1116-47269 - Two adult Lionesses (Panthera leo) peer down from branches of an Acacia tree in Serengeti National Park, Tanzania

1116-47254 - Wildebeest (Connochaetes taurinus) mother stares at it's still-wet newborn calf that has just struggled to it's feet in the Ndutu area of the Ngorongoro Conservation Area on the Serengeti Plains, Tanzania

1116-47248 - Pair of Zebra (Equus grevyi) stallions fighting on dusty plains of Ngorongoro Crater, Ngorongoro Conservation Area, Tanzania

1116-47265 - Leopard (Panthera pardus) resting in tree in the Ndutu area of the Ngorongoro Crater Conservation Area on the Serengeti Plains, Tanzania

1116-47261 - Colourful male Mwanza Flat-headed Rock Agama (Agama mwanzae) on a rock in Serengeti National Park, Tanzania

1116-47253 - Long-crested Eagle (Lophaetus occipitalis) perched on dead snag in the Ndutu area of the Ngorongoro Crater Conservation Area on the Serengeti Plains, Tanzania

1116-47251 - Superb Starling (Lamprotornis superbus) perched on thorny Acacia branch in Ngorongoro Crater, Ngorongoro Conservation Area, Tanzania

1116-47250 - Large male African Buffalo (Syncerus caffer) resting in short grass in Ngorongoro Crater, Ngorongoro Conservation Area, Tanzania

1116-47267 - Adult Lioness (Panthera leo) stares down from a tree in Serengeti National Park, Tanzania

1116-47262 - Pair of Zebra (Equus grevyi) stallions rise on hind feet to kick and bite each other as they fight on the floor of Ngorongoro Crater, Ngorongoro Conservation Area, Tanzania

1116-47255 - Yellow-billed Kite (Milvus aegyptius) perched on stone in Ngorongoro Crater, Ngorongoro Conservation Area, Tanzania

1116-47259 - Sykes (or White-throated monkey) Monkey (Cercopithecus albogularis) hangs from branch by one foot to drink from pond at Ngare Sero Mountain Lodge, near Arusha, Tanzania

1116-47272 - Black-and-white Colobus Monkeys (Colobus guereza) relaxing on tree branches at Ngare Sero Mountain Lodge, near Arusha, Tanzania

1116-47271 - Lilac-breasted Roller (Coracias caudata) perched on termite mound in Tarangire National Park, Tanzania

1116-47249 - Male Kori Bustard (Ardeotis kori) in mating display in Ngorongoro Crater, Ngorongoro Conservation Area, Tanzania

1116-47270 - Close-up of female Lion (Panthera leo) resting near tree in Tarangire National Park, Tanzania

1116-47247 - Large herd of Wildebeest (Connochaetes taurinus) spread across the plains in Serengeti National Park, Tanzania

1116-47260 - Colourful male Kenyan Rock Agama (Agama lionotis) basking on rock at KIA Lodge near Kilimanjaro International Airport, Arusha, Tanzania

1116-47268 - Adult Lioness (Panthera leo) rests her head on a branch while perched in a tree in Serengeti National Park, Tanzania

1116-47256 - Sunset over Lake Eyasi, near Kisima Ngeda Tented Camp, Tanzania

1116-47263 - Side-view head shot of yawning Hippopotamus (Hippopotamus amphibius) in Ngorongoro Conservation Area, Tanzania

1116-47177 - Male Ruffed Grouse (Bonasa Umbellus) With Tail Feathers And Neck Ruff Extended In Courtship Display, Late Winter, Fairbanks, Alaska, United States Of America

1116-44256 - Two Lionesses (Panthera Leo) Reflected In Pool, Serengeti National Park, Tanzania

1116-44267 - Two Small Lion (Panthera Leo) Cubs Walking Down Dirt Road, Serengeti National Park, Tanzania

1116-44257 - Lioness (Panthera Leo) Stalking Prey, Samburu National Reserve, Kenya

1116-44252 - Maasai Giraffe (Giraffa Camelopardalis) With Calf In Dry Season Grasslands Of Serengeti National Park, Tanzania

1116-44260 - Two Spotted Hyenas (Crocuta Crocuta) Feeding On Carcass Of Another Spotted Hyena, Ngorongoro Crater, Tanzania

1116-44264 - Mating Lions (Panthera Leo), Serengeti National Park, Tanzania

1116-44241 - Black Rhinoceros (Diceros Bicornis) Running Across Dry, Dusty Savannah, Ngorongoro Crater, Tanzania

1116-44235 - Large Group Of Wildebeest (Connochaetes Taurinus) Surge Across The Flooded Mara River In Serengeti National Park, Tanzania