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Adult gentoo penguins (Pygoscelis papua) courtship display, Neko Harbor, Antarctica, Southern Ocean, Polar Regions

Adult gentoo penguins (Pygoscelis papua) mating colony on Cuverville Island, Antarctica, Southern Ocean, Polar Regions

Adult gentoo penguin (Pygoscelis papua) on ice in Mickelson Harbor, Antarctica, Southern Ocean, Polar Regions

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

Historic Kilauea Lighthouse on Kilauea Point National Wildlife Refuge, Kauai, Hawaii, United States of America, Pacific

Adult humpback whale (Megaptera novaeangliae) flukes-up dive, Snow Pass, Southeast Alaska, United States of America, North America

Adult trumpeter swan (Cygnus buccinator) near LeConte Glacier outside Petersburg, Southeast Alaska, United States of America, North America

Northern (Steller) sea lions (Eumetopias jubatus), on channel marker outside Petersburg, Southeastern Alaska, United States of America, North America

Northern (Steller) sea lions (Eumetopias jubatus), South Marble Island, Glacier Bay National Park, Southeastern Alaska, United States of America, North America

Flamingos at Laguna Colorada (Red Lagoon), a salt lake in the Altiplano of Bolivia in Eduardo Avaroa Andean Fauna National Reserve, Bolivia, South America

Orbicular batfish (Platax orbicularis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Bosque de Apache National Wildlife Refuge, Socorro, New Mexico, United States of America, North America

Green-winged teal (Anas crecca) hen swimming, Pike and San Isabel National Forest, Colorado, United States of America, North America

Lion (Panthera leo) cub on a downed tree trunk in the rain, Ngorongoro Crater, Tanzania, East Africa, Africa

Sally Lightfoot crab (Grapsus Grapsus), Sullivan Bay, Isla Santiago, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Southern elephant seal (Mirounga leonina) pups, Gold Harbour, South Georgia, South Atlantic Ocean, Polar Regions

Northern giant petrel (Macronectes halli) fighting over dead fur seal carcass, Gold Harbour, South Georgia, South Atlantic Ocean, Polar Regions

Southern elephant seal (Mirounga leonina) bulls fighting at Gold Harbour, South Georgia, South Atlantic Ocean, Polar Regions

King penguins (Aptenodytes patagonicus), Gold Harbour, South Georgia Island, South Atlantic Ocean, Polar Regions

King penguin (Aptenodytes patagonicus) chicks, Gold Harbour, South Georgia Island, South Atlantic Ocean, Polar Regions

King penguins (Aptenodytes patagonicus), Gold Harbour, South Georgia Island, South Atlantic Ocean, Polar Regions

King penguins (Aptenodytes patagonicus), Peggoty Bluff, South Georgia Island, South Atlantic Ocean, Polar Regions

King cormorant (Phalacrocorax albiventer), Wildlife Conservation Society Preserve of Karukinka, Strait of Magellan, Chile, South America

Imperial shag (Phalacrocorax atriceps albiventer) breeding colony on New Island, Falkland Islands, South Atlantic Ocean, South America

Muskox bulls (Ovibos moschatus), Myggebukta (Mosquito Bay), Christian X's Land, Northeast Greenland, Polar Regions

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

Bison (Bison bison) bulls sparring, Custer State Park, South Dakota, 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

Giant sponge showing how it filters water with the use of dye, Dominica, West Indies, Caribbean, Central America

Hawksbill turtle (Eretmochelys) with a tracking device on its back, Dominica, West Indies, Caribbean, Central America

Kori bustard (Ardeotis kori), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Anemonefish (Amphiprion ocellaris) and sea anemone, Southern Thailand, Andaman Sea, Indian Ocean, Southeast Asia, Asia

Harlequin ghost pipefish (Solenostomus paradoxus), Southern Thailand, Andaman Sea, Indian Ocean, Southeast Asia, Asia

Colony of magnificent anemone (Heteractis magnifica), Colony, Ras Mohammed National Park, off Sharm el Sheikh, Sinai, Egypt, Red Sea, Egypt, North Africa, Africa

Adult and young Coke's hartebeest (Alcelaphus buselaphus cokii) drinking, Serengeti National Park, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cubs, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Freshwater crocodiles (Crocodylus johnstoni), The Wildlife Habitat, Port Douglas, Queensland, Australia, Pacific

Long-tailed shrike (magpie shrike) (Corvinella melanoleuca), Kruger National Park, South Africa, Africa

Two black-tailed prairie dog (blacktail prairie dog) (Cynomys ludovicianus) with one calling, Custer State Park, South Dakota, United States of America, North America

Cape buffalo (African buffalo) (Syncerus caffer) cow and calf drinking, Kruger National Park, South Africa, Africa

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

Orange-throated longclaw (Cape longclaw) (Macronyx capensis), Mountain Zebra National Park, South Africa, Africa

Pearl-spotted owlet (pearl-spotted owl) (Glaucidium perlatum), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Male dusky grouse (blue grouse) (Dendragapus obscurus) displaying, Yellowstone National Park, Wyoming, United States of America, North America

Elegant tern (Thalasseus elegans) colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant tern (Thalasseus elegans, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant terns (Thalasseus elegans), Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Adult brown pelican (Pelecanus occidentalis), Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Heermann's gull (Larus heermanni) adult with egg, Isla Rasa, Gulf of California (Sea of Cortez), Mexico, North America

Adult spinetail mobula (Mobula japanica) leaping, Isla Espiritu Santo, Gulf of California (Sea of Cortez), Baja California Sur, Mexico, North America

Long-beaked common dolphins (Delphinus capensis), Isla San Esteban, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Long-beaked common dolphins (Delphinus capensis) at sunrise, Isla San Esteban, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

California gray whale (Eschrichtius robustus) caudal peduncle, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Spotted eagle ray (Aetobatus narinari) underwater, Leon Dormido Island, San Cristobal Island, Galapagos Islands, Ecuador, South America

Flightless cormorant (Nannopterum harrisi) hunting underwater, Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Juvenile yellow-crowned night heron (Nyctanassa violacea), Genovesa Island, Galapagos Islands, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) underwater, Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Blue-footed booby (Sula nebouxii) pair, North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult waved albatross (Diomedea irrorata) with single egg, Espanola Island, Galapagos Islands, Ecuador, South America

Galapagos sea lions (Zalophus wollebaeki) underwater, Guy Fawkes Islands, Galapagos Islands, Ecuador, South America

Adult dark morph red-footed booby (Sula sula) with chick, Genovesa Island, Galapagos Islands, Ecuador, South America

Nazca booby (Sula grantii) chick, Punta Suarez, Santiago Island, Galapagos Islands, Ecuador, South America

Lava gull (Leucophaeus fuliginosus), Puerto Ayora, Santa Cruz Island, Galapagos Islands, Ecuador, South America

Galapagos marine iguana (Amblyrhynchus cristatus), Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos marine iguanas (Amblyrhynchus cristatus), Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America