Richard Du Toit / Northern Giraffe (Giraffa camelopardalis) mother and calf, Itala Game Reserve, KwaZulu-Natal, South Africa

Piotr Naskrecki / African Lungfish (Protopterus annectens), Gorongosa National Park, Mozambique

Piotr Naskrecki / Straw-colored Fruit Bat (Eidolon helvum) group roosting, Maputo, Mozambique

Piotr Naskrecki / Scorpion (Opisthacanthus asper), seen in UV light, Gorongosa National Park, Mozambique

Piotr Naskrecki / Katydid (Clonia wahlbergi) in defensive posture, Gorongosa National Park, Mozambique

Piotr Naskrecki / African Paradise-Flycatcher (Terpsiphone viridis) flying, Gorongosa National Park, Mozambique

Piotr Naskrecki / Butterfly Bat (Glauconycteris variegata) drinking, Gorongosa National Park, Mozambique

Piotr Naskrecki / Decken's Horseshoe Bat (Rhinolophus deckenii) drinking, Gorongosa National Park, Mozambique

Piotr Naskrecki / Chestnut Short-tailed Bat (Carollia castanea) flying, La Selva Biological Reserve, Costa Rica

Piotr Naskrecki / Hairy Big-eyed Bat (Chiroderma villosum) flying, Costa Rica

Piotr Naskrecki / Silky Short-tailed Bat (Carollia brevicauda) flying, La Selva Biological Reserve, Costa Rica

Piotr Naskrecki / Egyptian Fruit Bat (Rousettus aegyptiacus) flying, Gorongosa National Park, Mozambique

Piotr Naskrecki / Red-eyed Tree Frog (Agalychnis callidryas), Belize

Piotr Naskrecki / Mexican Red Rump Tarantula (Brachypelma vagans), Belize

Juergen & Christine Sohns / Swamp Wallaby (Wallabia bicolor) mother and joey, Mount Lofty, South Australia, Australia

Juergen & Christine Sohns / Eastern Grey Kangaroo (Macropus giganteus) mother with joey, Maloney Beach, New South Wales, Australia

Juergen & Christine Sohns / Koala (Phascolarctos cinereus), Parndana, Kangaroo Island, South Australia, Australia

Tim Fitzharris / West Indian Manatee (Trichechus manatus) group, North America

Hiroya Minakuchi / Humpback Whale (Megaptera novaeangliae) trio gulp feeding, Inside Passage, southeast Alaska

Mark Raycroft / Border Collie (Canis familiaris), North America

Michael Quinton / Northern Hawk Owl (Surnia ulula) peering from nest, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing on a Pussy Willow (Salix discolor) twig in winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing on a Pussy Willow (Salix discolor) twig in winter, Alaska

Juergen & Christine Sohns / Meerkat (Suricata suricatta) trio on guard, Oudtshoorn, South Africa

Juergen & Christine Sohns / Black-footed Penguin (Spheniscus demersus) pair on beach, Betty's Bay, Stony Point Nature Reserve, South Africa

Juergen & Christine Sohns / African Elephant (Loxodonta africana) calf, Addo National Park, South Africa

Juergen & Christine Sohns / African Elephant (Loxodonta africana) calf drinking at waterhole, Addo National Park, South Africa

Juergen & Christine Sohns / African Elephant (Loxodonta africana) mother browsing with calves, Addo National Park, South Africa

Sebastian Kennerknecht / Harbor Seal (Phoca vitulina) pup, Elkhorn Slough, Monterey Bay, California

Sebastian Kennerknecht / Harbor Seal (Phoca vitulina) pup, Elkhorn Slough, Monterey Bay, California

Sebastian Kennerknecht / American Black Vulture (Coragyps atratus) flying near skyscrapers, Ancon Hill, Panama City, Panama

Sebastian Kennerknecht / American Bison (Bison bison) female cleaning nose with tongue, Yellowstone National Park, Wyoming

Sebastian Kennerknecht / American Bison (Bison bison) female in winter, Yellowstone National Park, Wyoming

Heike Odermatt / Walrus (Odobenus rosmarus), Svalbard, Norway

Chien Lee / Ocelot (Leopardus pardalis) male in cloud forest, Mashpi Amagusa Reserve, Pichincha, Ecuador

Chien Lee / Sugar Glider (Petaurus breviceps) feeding on Acacia (Acacia sp) tree sap at night, Wasur National Park, Papua, Indonesia

Richard Du Toit / Cape White-eye (Zosterops capensis) on Cape Honeysuckle (Tecomaria capensis), Garden Route National Park, South Africa

Richard Du Toit / Burchell's Zebra (Equus burchellii) trio nuzzling, Itala Game Reserve, South Africa

Benjamin Olson / Gentoo Penguin (Pygoscelis papua) wading, Antarctica

Benjamin Olson / Gentoo Penguin (Pygoscelis papua) wet from rain due to climate change, Antarctica

Benjamin Olson / Great Gray Owl (Strix nebulosa), Sax-Zim Bog, Minnesota

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) mother and foal, Oshoto, Wyoming

Yva Momatiuk & John Eastcott / Tourist next to cascades, Dynjandi Waterfall, Westfjords, Iceland

Yva Momatiuk & John Eastcott / Atlantic Puffin (Fratercula arctica) pair, Latrabjarg, Westfjords, Iceland

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) sixteen month old baby female, named Gossamer, in tree, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) five year old juvenile female, named Fadhila, playing with her three year old brother, named Fifty, Gombe National Park, Tanzania

Chien Lee / Amazon Horned Frog (Ceratophrys cornuta), Yasuni National Park, Ecuador

Chien Lee / White-lined Leaf Frog (Phyllomedusa vaillanti) in rainforest, Ecuador

Chien Lee / Giant Crab Spider (Sparassidae) feeding on young Peacock Day Gecko (Phelsuma quadriocellata), Madagascar

Chien Lee / Lesser Long-tongued Fruit Bat (Macroglossus minimus) approaching Durian (Durio zibethinus) flower nectar, Danum Valley Conservation Area, Sabah, Borneo, Malaysia

Jaymi Heimbuch / Yellow-billed Oxpecker (Buphagus africanus) picking parasites off of Cape Buffalo (Syncerus caffer), Masai Mara, Kenya

Mark Raycroft / German Shepherd (Canis familiaris) puppies, North America

Mark Raycroft / Cocker Spaniel (Canis familiaris) puppy playing, North America

Alan Murphy/ BIA / Red-winged Blackbird (Agelaius phoeniceus) male, Texas

Thomas Hinsche/ BIA / European Bee-eater (Merops apiaster) pair squabbling, Saxony-Anhalt, Germany

Thomas Hinsche/ BIA / European Bee-eater (Merops apiaster) pair, Saxony-Anhalt, Germany

Marion Vollborn/ BIA / African Lion (Panthera leo) cubs drinking at waterhole, Okavango Delta, Botswana

Alan Murphy/ BIA / Peregrine Falcon (Falco peregrinus) flying, Texas

Donald M. Jones / Yellow-bellied Marmot (Marmota flaviventris) yawning, central Montana

Donald M. Jones / Ruffed Grouse (Bonasa umbellus) in defensive display, Yaak, Montana

Donald M. Jones / Resplendent Quetzal (Pharomachrus mocinno) male, Costa Rica

Donald M. Jones / Red-lored Parrot (Amazona autumnalis), Costa Rica

Donald M. Jones / Red Squirrel (Tamiasciurus hudsonicus) on pine cone flakes, western Montana

Donald M. Jones / Brown Bear (Ursus arctos) feeding on dandelions, western Canada

Donald M. Jones / Curve-billed Thrasher (Toxostoma curvirostre) pair, southern Arizona

Donald M. Jones / Curve-billed Thrasher (Toxostoma curvirostre), southern Arizona

Donald M. Jones / Collared Pika (Ochotona collaris), Denali National Park, Alaska

Donald M. Jones / Black Bear (Ursus americanus) cub in tree, western Canada

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram, western Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ewe and ram, western Montana

Donald M. Jones / Caribou (Rangifer tarandus) bull in tundra, Denali National Park, Alaska

Tui De Roy / Saddleback Galapagos Tortoise (Chelonoidis nigra hoodensis) in defensive posture, Espanola Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) pair mating, Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) on ridge, Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi), Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi), Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) group wallowing in mud at night, Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi), Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) group wallowing in mud at night, Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) group wallowing in seasonal pond, Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) group wallowing in seasonal pond, Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Marion Vollborn/ BIA / Cheetah (Acinonyx jubatus) cub, native to Africa

Mario Suarez Porras/ BIA / Atlantic Puffin (Fratercula arctica) with fish prey, Farne Islands, England, United Kingdom

Mario Suarez Porras/ BIA / Grasshopper Warbler (Locustella naevia) calling, Asturias, Spain

Jan Wegener/ BIA / Grey Heron (Ardea cinerea) spreading wings on frozen lake, Berlin, Germany

Nick Saunders/ BIA / Boreal Owl (Aegolius funereus) chicks, Saskatchewan, Canada

Tui De Roy / King Penguin (Aptenodytes patagonicus) pair, Volunteer Beach, East Falkland Island, Falkland Islands

Tim Fitzharris / Sumatran Orangutan (Pongo abelii) male, native to Sumatra

Agustin Esmoris / Yellow Cururu Toad (Rhinella icterica), Argentina

Agustin Esmoris / Southern Elephant Seal (Mirounga leonina) male calling and bleeding after fight, Puerto Madryn, Argentina

Agustin Esmoris / Bananaquit (Coereba flaveola) on flower, Argentina

Tui De Roy / Nazca Booby (Sula granti) group on coast, Wolf Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) parent and chicks at nest, Santa Cruz Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) males courting female, Punta Vicente Roca, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) feet, Seymour Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) incubating eggs, Santa Cruz Island, Galapagos Islands, Ecuador