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Bull Elk (Cervus canadensis) in snow, Yellowstone National Park, Wyoming, United States of America, North America

Wood Duck (Aix sponsa) drake swimming, Sterne Park, Littleton, Colorado, United States of America, North America

Adult gentoo penguin (Pygoscelis papua), feeding chicks at Brown Bluff near the Antarctic Peninsula, Southern Ocean, Polar Regions

Southern right whale (Eubalaena australis) flukes-up dive near whale watching boat in Puerto Pyramides, Argentina, South America

Southern right whale (Eubalaena australis) mother and calf near whale watching boat in Puerto Pyramides, Argentina, South America

Southern right whale (Eubalaena australis) adult female flukes-up to catch the wind in Puerto Pyramides, Argentina, South America

Southern right whale (Eubalaena australis) adult female lifting both her head and flukes out of the water in Argentina, South America

Adult Magellanic penguin (Spheniscus magellanicus) at a breeding site on Peninsula Valdez, Patagonia, Argentina, South America

An adult great blue heron (Ardea herodias) perched beside a river in Misty Fjords National Monument, United States of America, North America

Several species of gull feeding on small baitfish in Snow Pass, Southeast Alaska, United States of America, North America

Chinstrap penguin (Pygoscelis antarctica), leaping at breeding colony at Half Moon Island, Antarctica, Southern Ocean, Polar Regions

Hoatzin (Ophisthocomus hoazin) perching on branch by Lake Sandoval, Tambopata National Reserve, Puerto Maldonado, Madre de Dios, Peru, South America

Adult gentoo penguin (Pygoscelis papua), feeding chicks at Brown Bluff near the Antarctic Peninsula, Southern Ocean, Polar Regions

Collared Pika (Ochotona collaris) taking food to a cache, Hatcher Pass, Alaska, United States of America, North America

Chinstrap penguin (Pygoscelis antarctica), at breeding colony at Half Moon Island, Antarctica, Southern Ocean, Polar Regions

Adult gentoo penguin (Pygoscelis papua), on eggs at Port Lockroy, Antarctica, Southern Ocean, Polar Regions

Bighorn Sheep (Ovis canadensis) ram, Yellowstone National Park, Wyoming, United States of America, North America

This sunflower star is the largest of species in the Pacific Northwest and is a voracious carnivore.

Adult gentoo penguins (Pygoscelis papua), returning and coming from the sea at Booth Island, Antarctica, Southern Ocean, Polar Regions

Adult voracious gecko (Gehyra vorax), at night on the Volivoli Resort grounds on Viti Levu, Fiji, South Pacific, Pacific

Adult gentoo penguins (Pygoscelis papua), returning and coming from the sea at Booth Island, Antarctica, Southern Ocean, Polar Regions

Adult gentoo penguin (Pygoscelis papua), feeding chicks at Brown Bluff near the Antarctic Peninsula, Southern Ocean, Polar Regions

Critically Endangered Nicaraguan sub-species of the Black-handed (Geoffroy's) spider monkey (Ateles geoffroyi geoffroyi), El Salvador, Central America

Green Sea Turtle (Chelonia mydas) nesting site at night on Long Beach on Ascension Island, Tropical Atlantic Ocean, South Atlantic Ocean

Young northern gannet (Morus bassanus) in flight near Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

King penguin (Aptenodytes patagonicus) detail at breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean, Polar Regions

Adult southern rockhopper penguin (Eudyptes chrysocome chrysocome) at breeding and molting colony, Falkland Islands, South America

First year Adelie penguin (Pygoscelis adeliae) chick at breeding colony at Brown Bluff, Antarctica, Polar Regions

Fungus on tree trunk, Pyrddin Gorge, Pontneddfechan, Neath Valley, South Wales, United Kingdom, Europe

Moon jellyfish (Aurelia aurita), Aquarium of San Sebastian, Bay of Biscay, province of Gipuzkoa, Basque Country, Spain, Europe

Adult waved albatrosses (Diomedea irrorata) at breeding colony on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

The endemic Opuntia cactus (Opuntia echios) cactus growing in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Two Welsh Mountain Sheep at Croesor Mine, Cwm Croesor, Snowdonia National Park (Eryri), North Wales, United Kingdom, Europe

Adult blue-footed booby (Sula nebouxii) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lions (Zalophus wollebaeki) hauled out on the beach in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lions (Zalophus wollebaeki) hauled out on the beach in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Gentoo penguins (Pygoscelis papua) hauled out in Port Foster, inside the caldera at Deception Island, Antarctica, Polar Regions

Crabeater seals (Lobodon carcinophaga) hauled out on ice floe near the Antarctic Peninsula, Antarctica, Polar Regions

Pregnant female southern elephant seal (Mirounga leonina) giving birth on the beach in Stromness Bay, South Georgia Island

Female southern elephant seal (Mirounga leonina) with newborn pup on the beach in Stromness Bay, South Georgia Island

White rhino (Ceratotherium simum), with redbilled oxpecker (Buphagus erythrorhynchus), Royal Hlane National Park, Swaziland, Africa

Grey seal (Halichoerus grypus), Farne Islands, Seahouses, Northumberland, England, United Kingdom, Europe

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

Swift fox (Vulpes velox) kit biting its mother's ear, Pawnee National Grassland, Colorado, United States of America, North America

Pygmy short-horned lizard (Phrynosoma douglasi douglasi), Pawnee National Grassland, 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) kit, Pawnee National Grassland, Colorado, United States of America, North America

Two whitetail deer (Odocoileus virginianus) doe running, Stillwater County, Montana, United States of America, North America

Juvenile double-crested cormorant (Phalacrocorax auritus) spreading its wings to dry, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Female lion (Panthera leo) hunting wildebeest, Masai Mara National Reserve, Kenya, East Africa, Africa

Female broad-tailed hummingbird (Selasphorus platycercus) in flight, Red Feather Lakes District, Roosevelt National Forest, Colorado, United States of America, North America

Herd of blue wildebeest (brindled gnu) (Connochaetes taurinus) and common zebras (Burchell's zebra) (Equus burchelli) drinking at Mara River, Masai Mara National Reserve, Kenya, East Africa, Africa

Female broad-tailed hummingbird (Selasphorus platycercus) in flight, Red Feather Lakes District, Roosevelt National Forest, Colorado, United States of America, North America

Female broad-tailed hummingbird (Selasphorus platycercus) perched, Routt National Forest, Colorado, United States of America, North America

Captive river otter (Lutra canadensis) swimming, Arizona Sonora Desert Museum, Tucson, Arizona, United States of America, North America

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

Canadian Lynx (Lynx canadensis) in a tree, in captivity, near Bozeman, Montana, United States of America, North America

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

Arctic tern (Sterna paradisaea) in flight, Farne Islands, Northumberland coast, England, United Kingdom, Europe

Black-crowned night-heron (Nycticorax nycticorax), Bear River Migratory Bird Refuge, Utah, United States of America, North America

Wild horse (Equus Caballus) mare and foal, Green River, Wyoming, United States of America, North America

Adult flame-backed fiddler crab (Tubuca flammulain), Porosus Creek, Frederick Harbor, Kimberley, Western Australia, Australia, Pacific

Arctic ground squirrel (Parka squirrel) (Citellus parryi), Hatcher Pass Alaska, United States of America, North America

Adult Swallow-Tailed Gull, showing breeding season red rimmed eye, a nocturnal equatorial seabird, found almost exclusively in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America