Sebastian Kennerknecht / Minden / South African Giraffe (Giraffa giraffa giraffa) female in Mopane (Colophospermum mopane) woodland, Kruger National Park, South Africa

Chien Lee / Minden / Black-headed Cat Snake (Boiga nigriceps) swallowing alive Harlequin Flying Tree Frog (Rhacophorus pardalis) prey, Kubah National Park, Sarawak, Malaysia, sequence 1 of 4

Theo Allofs / Giant River Otter (Pteronura brasiliensis) feeding on fish prey, Pantanal, Brazil

Juergen & Christine Sohns / Brown Bear (Ursus arctos), native to northern hemisphere

Chase Dekker / Humpback Whale (Megaptera novaeangliae) breaching, Monterey Bay, California

Chase Dekker / Humpback Whale (Megaptera novaeangliae) breaching, Monterey Bay, California

Suzi Eszterhas / Brown-throated Three-toed Sloth (Bradypus variegatus) mother with four-month-old young, Puerto Viejo de Talamanca, Costa Rica

Ch'ien Lee / Huntsman Spider (Heteropoda sp) defending egg sac from Peters' Bow-fingered Gecko (Cyrtodactylus consobrinus), Gua Baju, Sarawak, Borneo, Malaysia

Jami Tarris / Mountain Gorilla (Gorilla gorilla beringei) mother and juvenile, Bwindi Impenetrable National Park, Uganda

Chase Dekker / Common Dolphin (Delphinus delphis) surfacing, California

Chase Dekker / Orca (Orcinus orca) male surfacing, Monterey Bay, California

ZSSD / Hamadryas Baboon (Papio hamadryas) male yawning, captive

Christian Ziegler / Bonobo (Pan paniscus) holding frog, Lola Ya Bonobo Sanctuary, Democratic Republic of the Congo

Christian Ziegler / Olingo (Bassaricyon gabbii) feeding on Balsa Tree (Ochroma lagopus) flower nectar at night, Barro Colorado Island, Panama

Thomas Hinsche/ BIA / Great Cormorant (Phalacrocorax carbo) predating fish, Hungary

Tui De Roy / Great Frigatebird (Fregata minor) parent and chick on nest, Genovesa Island, Galapagos Islands, Ecuador

Steve Gettle / Black-wing Damselfly (Calopteryx maculata), Brighton Recreation Area, Michigan

Yva Momatiuk & John Eastcott / Leopard Seal (Hydrurga leptonyx), Antarctic Peninsula, Antarctica

Peter Mather / Muskox (Ovibos moschatus) pair fighting, Dalton Highway, Alaska

Steve Gettle / Jesus Christ Lizard (Basiliscus vittatus), Costa Rica

Winfried Wisniewski / Griffon Vulture (Gyps fulvus) at feeding station, Extremadura, Spain

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) buck in winter, North America

Mark Raycroft / Elk (Cervus elaphus) bull in autumn, North America

Donald M. Jones / American Darter (Anhinga anhinga) swallowing fish prey, Viera Wetlands, Florida

Donald M. Jones / American Bison (Bison bison) running in snow, Yellowstone National Park, Wyoming

Sebastian Kennerknecht / Sea Otter (Enhydra lutris) pup hugging mother, Elkhorn Slough, Monterey Bay, California

Sebastian Kennerknecht / Sea Otter (Enhydra lutris), Elkhorn Slough, Monterey Bay, California

Mark Raycroft / Woodland Caribou (Rangifer tarandus caribou) bull displaying, Newfoundland, Canada

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) pair greeting, Santa Fe Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) pair greeting, Santa Fe Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) pair nuzzling, Santa Fe Island, Galapagos Islands, Ecuador

Chase Dekker / Humpback Whale (Megaptera novaeangliae) breaching, Monterey Bay, California

Chase Dekker / Humpback Whale (Megaptera novaeangliae) breaching, Monterey Bay, California

Chase Dekker / Sea Otter (Enhydra lutris) feeding on Dungeness Crab (Cancer magister) prey, Monterey Bay, California

Juergen & Christine Sohns / African Lion (Panthera leo) six week old cubs, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / African Wild Dog (Lycaon pictus) group attacking Cape Warthog (Phacochoerus aethiopicus), Tswalu Game Reserve, South Africa

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

Martin Willis / Rainbow Lorikeet (Trichoglossus haematodus) pair preening during courtship, Magnetic Island, Queensland, Australia

Gary Bell/ Oceanwide / Humpback Whale (Megaptera novaeangliae) breaching, Tonga

Gary Bell/ Oceanwide / Scarlet Cleaner Shrimp (Lysmata amboinensis) cleaning mouth of Tomato Grouper (Cephalopholis sonnerati), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Scarlet Cleaner Shrimp (Lysmata amboinensis) cleaning Yellow-edged Moray (Gymnothorax flavimarginatus), Tulamben, Bali, Indonesia

Gary Bell/ Oceanwide / Scarlet Cleaner Shrimp (Lysmata amboinensis) cleaning Honeycomb Moray Eel (Gymnothorax favagineus), Tulamben, Bali, Indonesia

Chase Dekker / Humpback Whale (Megaptera novaeangliae) breaching at sunset, Monterey Bay, California

Chase Dekker / Humpback Whale (Megaptera novaeangliae) breaching, Monterey Bay, California

Chase Dekker / Humpback Whale (Megaptera novaeangliae) breaching at sunset, Monterey Bay, California

Suzi Eszterhas / Leopard (Panthera pardus) mother playing with her six-week-old cub, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) five-week-old cub playing with mother's tail, Jao Reserve, Botswana

Markus Johannsen/ BIA / Ring-necked Pheasant (Phasianus colchicus) male, Lower Saxony, Germany