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

Adult Galapagos barn owl (Tyto alba punctatissima) sleeping during the day on Santa Cruz Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Close up of king penguin's (Aptenodytes patagonicus) downy plumage (okum boy) on South Georgia Island, Southern Ocean, Polar Regions

King penguin (Aptenodytes patagonicus) breeding and nesting colony on South Georgia Island, Southern Ocean, Polar Regions

Yellow-footed gull (Larus livens), eggs in nest on Isla Coronado, Baja California Sur, Sea of Cortez, Mexico, North America

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

Adult rockhopper penguin (Eudyptes chrysocome chrysocome) at breeding and molting colony on New Island, Falkland Islands

Adult Imperial Shag (Phalacrocorax (atriceps) atriceps) exhibiting intense breeding plumage, New Island, Falkland Islands

Yellow-spotted river turtle (Podocnemis unifilis), Lake Sandoval, Tambopata National Reserve near Puerto Maldonado, Peru, South America

Lilac-breasted roller (Coracias caudata) with an insect, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

An adult anhinga (Anhinga anhinga), taking flight on New River near the Mesoamerican archaeological site of Lamanai, Belize

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

Adult austral thrush (Turdus falklandii falklandii), in the tussock grass on Carcass Island in the Falkland Islands, South America

Imperial Shag (Phalacrocorax atriceps), pair exhibiting courtship behavior on New Island in the Falkland Islands, South America

Imperial Shag (Phalacrocorax atriceps), pair exhibiting courtship behavior on New Island in the Falkland Islands, South America

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

Adult female Magellan goose (upland goose) (Chloephaga picta), on New Island in the Falkland Islands, South Atlantic Ocean, South America

Southern giant petrel (Macronectes giganteus), feeding on a sheep carcass at West Point Island, Falkland Islands, South America

Adult Subantarctic Skua (Catharacta antarctica lonnbergi) on tussac at Salisbury Plain on South Georgia Island, Polar Regions

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

Capped Heron (Pilherodius pileatus) perching on branch by Lake Sandoval, Tambopata National Reserve, Puerto Maldonado, Madre de Dios, Peru, South America

Southern yellow billed hornbill, Pilanesberg National Park, North West Province, South Africa, Africa

Adult black-legged kittiwake (Rissa tridactyla) in combat with a second kittiwake near Alexander Island, Franz Josef Land, Russia, Arctic Ocean, Eurasia

Adult black-legged kittiwake (Rissa tridactyla) in combat with a second kittiwake near Alexander Island, Franz Josef Land, Russia, Arctic Ocean, Eurasia

Adult snow petrel (Pagodroma nivea nivea), in flight near the Antarctic Peninsula, Antarctica, Southern Ocean, Polar Regions

Adult black-legged kittiwake (Rissa tridactyla) on nest with chick in the Svalbard Archipelago, Barents Sea, Norway, Arctic, Europe

Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

Adult Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult Swallow-tailed gull (Creagrus furcatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult Swallow-tailed gull (Creagrus furcatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecaudor, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecaudor, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecaudor, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Nazca booby (Sula grantii) downy chick stretching its wings to gather strength for flight in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

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

Adult Antarctic tern (Sterna vittata) resting on ship's rail near Tristan da Cunha, South Atlantic Ocean

Adult black noddy (Anous minutus) breeding site on Boatswain Bird Island just off Ascension island, South Atlantic Ocean

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

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

Adult South Georgia Pipit (Anthus antarcticus) feeding at low tide on Prion Island, Bay of Isles, South Georgia, Polar Regions

Adult South Georgia Pipit (Anthus antarcticus) feeding at low tide on Prion Island, Bay of Isles, South Georgia, Polar Regions

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

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

Southern giant petrel (Macronectes giganteus) in flight against the sun near South Georgia, Southern Ocean, Polar Regions

Adult light-mantled sooty albatross (Phoebetria palpebrata) on the wing in Elsehul on South Georgia, Southern Ocean, Polar Regions

Adult grey-headed albatross (Thalassarche chrysostoma) (grey-headed mollymawk), Elsehul, South Georgia, Polar Regions

Adult black-browed albatross (Thalassarche melanophrys) in Elsehul on South Georgia, Southern Ocean, Polar Regions

Adult black-crowned night-heron (Nycticorax nycticorax falklandicus) on Carcass Island in the Falkland Islands, South America

Adult cape petrels (Daption capense) feeding near Deception Island, Antarctica, Southern Ocean, Polar Regions

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

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

Blue-footed booby (Sula nebouxii) newly hatched chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Antarctic shag (Phalacrocorax (atriceps) bransfieldensis) at nesting site amongst gentoo penguins at Jougla Point, Antarctica, Polar Regions

Adult azure kingfisher (Ceyx azureus), perched in Porosus Creek, Frederick Harbor, Kimberley, Western Australia, Australia, Pacific

A Black-headed Gull (Larus ridibundus), on Brownsea Island, a nature reserve in Poole Harbour, Dorset, England, United Kingdom, Europe

Common ostrich (Struthio camelus) chick, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Beautiful sunbird (Cinnyris pulchella), male, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Fork-tailed drongo (Dicrurus adsimilis), Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Chinstrap penguins (Pygoscelis antarctica), ecstatic display at breeding colony at Half Moon Island, Antarctica, Polar Regions

Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

Adult yellow warbler (Dendroica petechia aureola) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult Swallow-tailed gull (Creagrus furcatus) in flight in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult wandering albatross (Diomedea exulans) in flight near the Tristan da Cunha Group, South Atlantic Ocean

Adult Antarctic tern (Sterna vittata) resting on the National Geographic Explorer near Tristan da Cunha, South Atlantic Ocean

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

King penguin (Aptenodytes patagonicus) adult and chick at breeding and nesting colony at Salisbury Plain, South Georgia, Polar Regions

Adult wandering albatrosses (Diomedea exulans) at nest site on Prion Island in the Bay of Isles, South Georgia, Polar Regions

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

Great frigatebird (Fregata minor) chick in the nest in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult cactus finch (Geospiza scandens), one of the 15 species of Darwin's finches, on Isla Santa Cruz, Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult Galapagos flycatcher (Large-billed flycatcher) (Myiarchus magnirostris) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Antarctic shag (Phalacrocorax (atriceps) bransfieldensis) at nesting site amongst gentoo penguins at Jougla Point, Antarctica, Polar Regions

Yellow-footed gull (Larus livens), eggs in nest on Isla Coronado, Baja California Sur, Sea of Cortez, Mexico, North America

Adult pied butcherbirds (Cracticus nigrogularis), taking flight in Vansittart Bay, Kimberley, Western Australia, Australia, Pacific

Southern ground-hornbill (ground hornbill) (Bucorvus leadbeateri), male, Kruger National Park, South Africa, Africa

Rupellss griffon vulture (Gyps rueppellii), Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Adult Swallow-tailed gull (Creagrus furcatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult black noddy (Anous minutus) breeding site on Boatswain Bird Island just off Ascension Island, South Atlantic Ocean

Adult South Georgia Pipit (Anthus antarcticus) feeding at low tide on Prion Island, Bay of Isles, South Georgia, Polar Regions

Adult Galapagos barn owl (Tyto alba punctatissima) sleeping during the day on Santa Cruz Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Swallow-tailed bee-eater (Merops hirundineus), juvenile with a butterfly, Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

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

Three Blue-headed parrots (Pionus menstruus) perching on tree, Tambopata National Reserve, Puerto Maldonado, Tambopata Province, Madre de Dios, Peru, South America

Swallow-tailed bee-eater (Merops hirundineus), Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Black-faced sandgrouse (Pterocles decoratus), male, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Common ostrich (Struthio camelus) female with two chicks, Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Tawny eagle (Aquila rapax), Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

A snowy egret (Egretta thula), fishing in the shallows, San Jose del Cabo, Baja California Sur, Sea of Cortez, Mexico, North America

Beautiful sunbird (Cinnyris pulchella), female, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa