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Black-browed albatross (Thalassarche melanophrys) adult at nest with chick, Steeple Jason Island, Falkland Islands, South Atlantic, South America

Male Spotted-backed weaver (Village weaver) (Ploceus cucullatus) building a nest, Hluhluwe Game Reserve, South Africa, Africa

Gentoo penguin (Pygoscelis papua) adult on nest with young chicks on Cuverville Island, Antarctica, Polar Regions

Four barn swallow (Hirundo rustica) chicks chirping, Custer State Park, South Dakota, United States of America, North America

Northern gannet nesting colony on the wave crashed island of Little Skellig Michael, County Kerry, Irish Sea, Republic of Ireland, Europe

Northern gannet nesting colony on the island of Little Skellig Michael, County Kerry, Munster, Irish Sea, Republic of Ireland, Europe

Leatherback turtle (Dermochelys coriacea) eggs being collected for transfer to a safer hatchery location, Shell Beach, Guyana, South America

Researchers measuring a female Leatherback turtle (Dermochelys coriacea) at its nest site, Shell Beach, Guyana, South America

Leatherback turtle (Dermochelys coriacea) eggs being collected for transfer to a safer hatchery location, Shell Beach, Guyana, South America

Southern masked weaver (Ploceus velatus), male building a nest, Kgalagadi Transfrontier Park, South Africa, Africa

King cormorant (Imperial cormorant) (Phalacrocorax atriceps) with nest materials, the Neck, Saunders Island, Falkland Islands, South America

A black-browed albatross (Thalassarche melanophris) looking at its chick, Saunders Island, Falkland Islands, South Atlantic, South America

Four barn swallow (Hirundo rustica) chicks chirp as parent approaches nest with food, Custer State Park, South Dakota, United States of America, North America

Male Spotted-backed weaver (Village weaver) (Ploceus cucullatus) building a nest, Hluhluwe Game Reserve, South Africa, Africa

Leatherback turtle (Dermochelys coriacea) laying eggs under the watchful eyes of a conservation worker, Shell Beach, Guyana, South America

Turtle warden with nesting Leatherback turtle (Dermochelys coriacea), Shell Beach, Guyana, South America

Male Spotted-backed weaver (Village weaver) (Ploceus cucullatus) building a nest, Hluhluwe Game Reserve, South Africa, Africa

Applying a tag to a Leatherback turtle (Dermochelys coriacea) at its nesting site, Shell Beach, Guyana, South America

Male Spotted-backed weaver (Village weaver) (Ploceus cucullatus) building a nest, Hluhluwe Game Reserve, South Africa, Africa

Osprey (Pandion haliaetus) chick practising flight, Gulf of California (Sea of Cortez) Baja California Sur, Mexico, North America

Adult osprey (Pandion haliaetus) with fish, Gulf of California (Sea of Cortez) Baja California Sur, Mexico, North America

Male Spotted-backed weaver (Village weaver) (Ploceus cucullatus) building a nest, Hluhluwe Game Reserve, South Africa, Africa

Adult osprey (Pandion haliaetus) with three chicks, Gulf of California (Sea of Cortez) Baja California Sur, Mexico, North America

Gentoo penguin (Pygoscelis papua) adult on nest with young chicks on Cuverville Island, Antarctica, Polar Regions

Leatherback turtle (Dermochelys coriacea) excavating a nest hole, Shell Beach, Guyana, South America

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

Osprey (Pandion haliaetus) on nest along the Madison River, Yellowstone National Park, Wyoming, United States of America, North America

Male Spotted-backed weaver (Village weaver) (Ploceus cucullatus) collecting grass for his nest, Addo Elephant National Park, South Africa, Africa

Kittiwakes (Rissa tridactyla) on small cliffs near Bakkagerdi (Borgafjordur Eystri), East Fjords (Austurland), Iceland, Polar Regions

Nesting Black-browed Albatross (Thalassarche melanophris), New Island, Falkland Islands, British Overseas Territory, South America

Adult and immature black-capped social weaver (Pseudonigrita cabanisi) near their nest, Samburu National Reserve, Kenya, East Africa, Africa

Black-browed albatross (Thalassarche melanophrys) chick, close-up, on the nest at nesting site on New Island, Falklands, South America

Ciconia (stork) nest on telegraph pole, village on the road from Sibiu to Sighisoara, Transylvania, Romania

Adult yellow-rumped cacique (Cacicus cela), at nest on the Rio Tres Irmao, Mato Grosso, Pantanal, Brazil, South America

Adult red ovenbird (Furnarius rufus), with nest on a Posada, Rio Pixaim, Mata Grosso, Pantanal, Brazil, South America

Adult red ovenbird (Furnarius rufus), building a nest in a tree, Rio Pixaim, Mata Grosso, Pantanal, Brazil, South America

Stripe-headed sparrow (Peucaea ruficauda) breeds from Mexico to north Costa Rica, eats seeds and insects, Esperanza, Guanacaste, Costa Rica

Yellow Crowned Night Heron (Nyctanassa Violacea), wading bird of the Americas that feeds on crustacea, Bermuda, Atlantic

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

Magellanic penguin (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Magellanic penguin (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Magellanic penguins (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Adult bald eagle (Haliaeetus leucocephalus) perched in Sitka spruce tree, Southeast Alaska, United States of America

Mated bald eagle (Haliaeetus leucocephalus) pair on nest near the Brooks River, Katmai National Park, Alaska, United States of America

Adult dovekie (Alle alle alle) breeding area on the island of Bolscheoya in the Svalbard Archipelago, Norway

Adult Atlantic puffins (Fratercula arctica), breeding on the island of Bolscheoya in the Svalbard Archipelago, Norway

Adult great skua (Stercorarius skua) being harassed by Arctic terns (Sterna paradisaea) guarding their nest sites, Svalbard, Norway

Adult black-legged kittiwakes (Rissa tridactyla) on ice in the Svalbard Archipelago, Barents Sea, Norway

Gentoo penguin (Pygoscelis papua) pair, changing places on nest, Damoy Point, Wiencke Island, Antarctic Peninsula, Antarctica, Polar Regions

Adult blue-footed boobies (Sula nebouxii,) nest exchange at Punta Pitt, San Cristobal Island, Galapagos, Ecuador, South America

Black-browed albatross (Thalassarche melanophris), chicks at breeding colony on Saunders Island, Falklands, South America

Black-browed albatross (Thalassarche melanophris), chicks at breeding colony on Saunders Island, Falklands, South America

Adult gentoo penguin (Pygoscelis papua) with minutes-old newly hatched chick at Gold Harbor on South Georgia

Adult gentoo penguin (Pygoscelis papua), with freshly hatched chicks at Petermann Island, Antarctica, Polar Regions

Adult male magnificent frigatebird (Fregata magnificens), on its nest, Iguana Island, Panama, Central America

Adult red-footed booby (Sula sula) returning to the nest site with nest building material in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Blue footed booby (sula nebouxii) nest, Punta Pitt, San Cristobal island, Galapagos, UNESCO, Ecuador

An adult red-footed booby (Sula sula), in its white color morph plumage in flight over the ocean in Palau, Micronesia, Pacific

Magnificent frigate bird (Fregata magnificens), North Seymour island, Galapagos Islands, Ecuador, South America

Nest of sociable weaver birds (philetairus socius) high up in a tree with mountains in background, Namib-Naukluft, Namibia, Africa

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

Black-browed albatross (Thalassarche melanophris), chicks at breeding colony on Saunders Island, Falklands, South America

Secretarybird (Sagittarius serpentarius) pair building a nest atop an acacia tree, Masai Mara National Reserve, Kenya, East Africa, Africa

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

Adult red ovenbird (Furnarius rufus), building a nest in a tree, Rio Pixaim, Mata Grosso, Pantanal, Brazil, South America

An adult red-footed booby (Sula sula), on the nest at Punta Pitt, San Cristobal Island, Galapagos, Ecuador, South America

An adult red-footed booby (Sula sula), on the nest at Punta Pitt, San Cristobal Island, Galapagos, Ecuador, South America

Adult gentoo penguin (Pygoscelis papua) feeding minutes-old newly hatched chick at Gold Harbor on South Georgia

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

Osprey (Pandion haliaetus), in flight to its nest, Isla San Lorenzo, Baja California, Sea of Cortez, Mexico, North America

Adult yellow-rumped caciques (Cacicus cela), at nest site on Belluda Cano, Amazon Basin, Loreto, Peru, South America

Adult Atlantic puffin (Fratercula arctica), returning to the nest site with fish (sand eels) for its chick on Grimsey Island, Iceland, Polar Regions

Adult Atlantic puffin (Fratercula arctica), returning to the nest site with fish (sand eels) for its chick on Grimsey Island, Iceland, Polar Regions

Adult blue-footed boobies (Sula nebouxii,) nest exchange at Punta Pitt, San Cristobal Island, Galapagos, Ecuador, South America

Magellanic penguin (Spheniscus magellanicus), Magdalena Island, Magallanes Region, Punta Arenas, Chile, South America

Adult gentoo penguin (Pygoscelis papua) with minutes-old newly hatched chick at Gold Harbor on South Georgia

Nesting Gentoo penguin (Pygoscelis papua), Grave Cove, West Falkland Island, Falkland Islands, British Overseas Territory, South America

Black-legged kittiwake (Rissa tridactyla) pair on nest in McBride Inlet, Glacier Bay National Park, Alaska, United States of America, North America

Adult Atlantic puffin (Fratercula arctica), returning to the nest site with fish (sand eels) for its chick on Grimsey Island, Iceland, Polar Regions

Loggerhead turtle (Caretta caretta), moving from nest to sea at night, Banga Nek, Kwazulu Natal, South Africa, Africa

Nesting storks on the the Iglesia de San Martin, on the left and centre, and Torre del Alfiler, on the right, Trujillo, Caceres, Extremadura, Spain, Europe