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Wood Stork (Mycteria Americana) in flight, Sanibel Island, J.N. Ding Darling National Wildlife Refuge, Florida, United States of America, North America

American White Pelican (Pelecanus erythrorhynchos) in flight shortly after taking off, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

A curious young polar bear (Ursus maritimus) approaches the National Geographic Explorer in the Svalbard Archipelago, Norway, Arctic, Europe

Brown booby (Sula leucogaster), in flight off small islet north of Isla San Marcos, Baja California Sur, Sea of Cortez, Mexico, North America

Cliffs at the Wick, on the south coast of Skomer Island, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

View from Park Service platform where adult brown bears (Ursus arctos) forage for salmon, Katmai National Park, Alaska, United States of America

Snow goose (Chen caerulescens) landing, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Sandhill crane (Grus Canadensis) in flight parachuting on approach to landing, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Two snow goose (Chen caerulescens) landing, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Adult sea otter (Enhydra lutris kenyoni) mother with her pup on her chest in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

Northern sea lions (Eumetopias jubatus) hauled out on South Marble Island in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Lava lizard (Microlophus spp) in the Galapagos Islands Archipelago, UNESCO World Heritage Site, Ecuador, South America

Sunrise on king penguin (Aptenodytes patagonicus) breeding and nesting colony at Salisbury Plain in the Bay of Isles, South Georgia, Southern Ocean, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

An adult eastern osprey (Pandion haliaetus cristatus), in flight over Montgomery Reef, Kimberley, Western Australia, Australia, Pacific

Atlantic Puffin (Fratercula arctica), on Skomer Island in July, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe

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

Great white egret (Ardea alba) looking for food, Sanibel Island, J.N. Ding Darling National Wildlife Refuge, Florida, United States of America, North America

Roseate spoonbill (Ajaia ajaja), J. N. "Ding" Darling National Wildlife Refuge, Florida, United States of America, North America

Adult black-browed albatross (Thalassarche melanophrys), pair in courtship display at nesting site on New Island, Falklands, South America

Mont-Saint-Michel bay and Abbey, UNESCO World Heritage Site, Manche department, Normandy region, France, Europe

An old, emaciated adult male polar bear (Ursus maritimus) desperately searching for food in the Svalbard Archipelago, Norway, Arctic, Europe

Views of the abandoned whale processing station at Whalers Bay on Deception Island, South Shetland Islands, Antarctica, Polar Regions

Gentoo penguin (Pygoscelis papua) adult with chick on Cuverville Island, Antarctica, Southern Ocean, Polar Regions

Gentoo penguin (Pygoscelis papua) breeding colony, outside refuge hut, at Petermann Island, Antarctica, Southern Ocean, Polar Regions

Black-necked stilt (Himantopus mexicanus), Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Striped skunk (Mephitis mephitis), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Adult black-browed albatross (Thalassarche melanophrys), in flight returning to nesting site on West Point Island, Falklands, South America

Crabeater seal (Lobodon carcinophaga) hauled out on ice floe near Adelie penguin in the Gullet near the Antarctic Peninsula, Antarctica, Polar Regions

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Red-tailed hawk (Buteo jamaicensis), juvenile, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

White-crowned sparrow (Zonotrichia leucophrys), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Snow goose (Chen caerulescens) in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Snow goose (Chen caerulescens) flock in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Vultures wait to steal eggs as Olive Ridley turtle digs nest at this refuge, Ostional, Nicoya Peninsula, Guanacaste, Costa Rica, Central America

Sandhill crane (Grus canadensis) in flight, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Juvenile great frigatebird (Fregata minor) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Two sandhill crane (Grus Canadensis) in the snow, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Western grebe (Aechmophorus occidentalis) swimming, Bear River Migratory Bird Refuge, Utah, United States of America, North America

Snow goose (Chen caerulescens) swimming, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Northern (Steller) sea lions (Eumetopias jubatus) hauled out at South Marble Island in Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Double-crested cormorant (Phalacrocorax auritus), Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Northern pintail (Anas acuta), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Red-tailed hawk (Buteo jamaicensis), juvenile, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Snowy egret (Egretta thula), Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Sharp-Shinned Hawk (Accipiter striatus), Bosque del Apache, National Wildlife Refuge, New Mexico, USA

Male yellow-headed blackbird (Xanthocephalus xanthocephalus), Bear River Migratory Bird Refuge, Utah, United States of America

Two sandhill crane (Grus canadensis) in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Semipalmated sandpiper (Calidris pusilla) wading while feeding, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Franklin's gull (Leucophaeus pipixcan), Bear River Migratory Bird Refuge, Utah, United States of America, North America

Magnificent frigatebirds (Fregata magnificens), perched on palm trees, Isla Iguana Wildlife Refuge, Panama, Central America

White-crowned sparrow (Zonotrichia leucophrys), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Olive Ridley turtle leaves after nesting at this crucial beach refuge, Playa Ostional, Nicoya Peninsula, Guanacaste, Costa Rica, Central America

Sandhill crane (Grus canadensis) in flight, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Great blue heron (Ardea herodias) in flight, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Bufflehead (Bucephala albeola), male, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Olive Ridley turtle digs nest in the sun at this crucial beach refuge, Playa Ostional, Nicoya Peninsula, Guanacaste, Costa Rica, Central America

Western grebe (Aechmophorus occidentalis) floating, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Greater Roadrunner (Geococcyx californianus), Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Brown pelican (Pelicanus occidentalis), J. N. "Ding" Darling National Wildlife Refuge, Florida, United States of America, North America

Yellow-crowned night heron (Nyctanassa violacea), J. N. "Ding" Darling National Wildlife Refuge, Florida, United States of America, North America

Pink clouds and pond at sunrise, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Semipalmated sandpiper (Calidris pusilla) wading while feeding, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Great white egret (Ardea alba) looking for food, Sanibel Island, J.N. Ding Darling National Wildlife Refuge, Florida, United States of America, North America

Kilauea Lighthouse, Kilauea Point, National Wildlife Refuge, Island of Kauai, Hawaii, United States of America, Pacific, North America

American White Pelican (Pelecanus erythrorhynchos), Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Two Sandhill Cranes (Grus canadensis) in flight in late afternoon light, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Greater Roadrunner (Geococcyx californianus), Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Thayer's gull (Larus thayeri), Kenai National Wildlife Refuge, Alaska, United States of America, North America

White-crowned sparrow (Zonotrichia leucophrys), juvenile, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Common snipe (Gallinago gallinago), Arapaho National Wildlife Refuge, Colorado, United States of America, North America

Snow goose (Chen caerulescens) flock in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Greater roadrunner (Geococcyx californianus), Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Snow goose (Chen caerulescens) in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

American alligator (Alligator mississipiensis), submerging, J.N. Ding Darling National Wildlife Refuge, Florida, United States of America, North America

Sandhill crane (Grus canadensis) taking off, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Sandhill crane (Grus canadensis) taking off from a pond, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Common snipe (Gallinago gallinago), Arapaho National Wildlife Refuge, Colorado, United States of America, North America

Western grebe (Aechmophorus occidentalis) courtship, Bear River Migratory Bird Refuge, Utah, United States of America

Beach and sea in Wasque Wildlife Refuge, Chappaquidick Island, Martha's Vineyard, Massachusetts, USA *** Local Caption ***

Sandhill crane (Grus canadensis) in flight, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Northern shoveler (Anas clypeata) in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Pink clouds and pond at sunrise, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Kilauea Point National Wildlife Refuge on the island of Kauai, Hawaii, United States of America, Pacific

Greater roadrunner (Geococcyx californianus), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Short-Billed Dowitcher (Limnodromus griseus) reflected at sunset, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Great egret (Ardea alba) in breeding plumage, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Great Egret (Ardea alba) with a fish, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Lesser Snow Geese (Chen C. caerulescens), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Lesser Snow Geese (Chen C. caerulescens), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Road warning sign, J. N. Ding Darling Wildlife Refuge, Sanibel Island, Florida, United States of America, North America

Yellow-crowned Night Heron (Nyctanassa violacea) standing in water, Sanibel Island, J. N. Ding Darling National Wildlife Refuge, Florida, United States of America, North America

Great egrets (Casmerodius albus), great blue heron (Ardea herodias) and roseate spoonbills (Ajaia ajaja), looking for fish in pond, Sanibel Island, J. N. Ding Darling National Wildlife Refuge, Florida, United States of America, North America

Wood Stork (Mycteria Americana) spreading wings and Roseate Spoonbills (Ajaia ajaja), Sanibel Island, J. N. Ding Darling National Wildlife Refuge, Florida, United States of America, North America

Tricolored herons (Egretta tricolor) standing in water, Sanibel Island, J. N. Ding Darling National Wildlife Refuge, Florida, United States of America, North America