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Adult common guillemot (Uria aalge) taking flight at nesting site on the cliffs at Bjornoya, Svalbard, Norway, Europe

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

Adult blue-footed booby (Sula nebouxii) with chicks on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Great frigatebird (Fregata minor) chick on the nest on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult black-legged kittiwakes (Rissa tridactyl) at a nesting site on Bjornoya, Svalbard, Norway, Europe

Rockhopper penguin (eudyptes chrysocome) new island, falkland islands, pair amongst the rocks, at nesting site.

The Valdes Peninsula (Spanish: Península Valdés), UNESCO World Heritage Site, a peninsula along the Atlantic coast in the Viedma Department of Chubut Province, Argentina

Male great frigate bird (Fregata minor) displaying with bright red gular pouch on nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean.

Adult male great frigate bird (Fregata minor) at nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean

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

Adult Tufted Puffin (Fratercula cirrhata) near nesting site on South Marble Island in Glacier Bay National Park, Southeast Alaska, USA. Pacific Ocean.

Adult Nazca booby (Sula grantii) nesting site on Punta Suarez on Espanola Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.

Juvenile great frigate bird (Fregata minor) nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean.

Juvenile great frigate birds (Fregata minor) vie for food on nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean

Male great frigate bird (Fregata minor) showing expanded gular pouch near nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador, Pacific Ocean.

Male great frigate bird (Fregata minor) in flight showing expanded gular pouch near nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean.

Adult red-footed booby (Sula sula) returning to the nest site with nest building material in the Galapagos Island Archipelago, Ecuador

Br�ï�¿�½�Ã�·nnich?s guillemot (Uria lomvia) breeding and nesting site at Cape Fanshaw in the Svalbard Archipelago, Barents Sea, Norway

Komodo dragon female on megapode mound (Varanus komodoensis) female uses these birds mounds for nesting site for her own eggs, Komodo Island, Indonesia

Magellanic penguins (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo on Peninsula Valdez, Patagonia, Argentina, South Atlantic

Adult male great frigate bird (Fregata minor) at nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean

Male great frigate bird (Fregata minor) displaying to each other on nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean

Adult male great frigate bird (Fregata minor) at nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean

Adult male great frigate bird (Fregata minor) at nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean

Adult Nazca booby (Sula grantii) in flight near nesting site on Punta Suarez on Espanola Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.

Adult Nazca booby (Sula grantii) with chick at nesting site on Punta Suarez on Espanola Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.

Bruennichs guillemot (Uria lomvia) breeding and nesting site at Cape Fanshaw in the Svalbard Archipelago, Barents Sea, Norway

Adult Tufted Puffin (Fratercula cirrhata) near nesting site on South Marble Island in Glacier Bay National Park, Southeast Alaska, USA. Pacific Ocean.

Great frigate bird (Fregata minor) nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean.

Adult male great frigate bird (Fregata minor) at nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean

Great frigate bird (Fregata minor) nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean.

Br�ï�¿�½�Ã�·nnich?s guillemot (Uria lomvia) breeding and nesting site at Cape Fanshaw in the Svalbard Archipelago, Barents Sea, Norway

Br�ï�¿�½�Ã�·nnich?s guillemot (Uria lomvia) breeding and nesting site at Cape Fanshaw in the Svalbard Archipelago, Barents Sea, Norway

Adult red-footed booby (Sula sula) returning to the nest site with nest building material in the Galapagos Island Archipelago, Ecuador

Br�ï�¿�½�Ã�·nnich?s guillemot (Uria lomvia) breeding and nesting site at Cape Fanshaw in the Svalbard Archipelago, Barents Sea, Norway

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

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

Adult Nazca booby (Sula grantii) head detail at nesting site on Punta Suarez on Espanola Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.

Great frigate bird (Fregata minor) nesting and breeding site on North Seymour Island in the Galapagos Island Group, Ecuador. Pacific Ocean.

Adult red-footed booby (Sula sula) returning to the nest site with nest building material in the Galapagos Island Archipelago, Ecuador

Two Nazca booby (Sula grantii) chicks at nesting site on Punta Suarez on Espanola Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.

Br�ï�¿�½�Ã�·nnich?s guillemot (Uria lomvia) breeding and nesting site at Cape Fanshaw in the Svalbard Archipelago, Barents Sea, Norway

Adult Nazca booby (Sula grantii) nesting site on Espanola Island in the Galapagos Island Group, Ecuador. Pacific Ocean.

Adult Nazca booby (Sula grantii) in flight near nesting site on Punta Suarez on Espanola Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.

Br�ï�¿�½�Ã�·nnich?s guillemot (Uria lomvia) breeding and nesting site at Cape Fanshaw in the Svalbard Archipelago, Barents Sea, Norway

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

Komodo dragon female on megapode mound (Varanus komodoensis) female uses these birds mounds for nesting site for her own eggs, Komodo Island, Indonesia

Adult Nazca booby head detail (Sula grantii) at nesting site on Punta Suarez on Espanola Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.

Adult Nazca booby (Sula grantii) nesting site on Espanola Island in the Galapagos Island Group, Ecuador. Pacific Ocean.

Two Nazca booby (Sula grantii) chicks at nesting site on Punta Suarez on Espanola Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.

Br�ï�¿�½�Ã�·nnich?s guillemot (Uria lomvia) breeding and nesting site at Cape Fanshaw in the Svalbard Archipelago, Barents Sea, Norway

Adult Nazca booby (Sula grantii) with chick at nesting site on Punta Suarez on Espanola Island in the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.

Snowy Owls (Nyctea scandiaca), two fledglings callingtdoors, outside, ornithology, zoology, color, colour

Birds' nests in a Saguaro cactus (Carnegiea gigantea) in Saguaro National Park, Tucson, Arizona, USA

Black Woodpecker (Dryocopus martius) at nest hole in a beech with chicks (Fagus sylvatica), Biosphaerenreservat Schwaebische Alb or Swabian Mountains Biosphere Reserve, UNESCO World Heritage Site, Baden-Wuerttemberg, Germany, Europe

Black Woodpecker (Dryocopus martius) at nest hole in a beech with chick (Fagus sylvatica), Biosphaerenreservat Schwaebische Alb or Swabian Mountains Biosphere Reserve, UNESCO World Heritage Site, Baden-Wuerttemberg, Germany, Europe

Great Spotted Woodpecker or Greater Spotted Woodpecker (Dendrocopos major), with insects in its beak at the nesting hole, Rhineland-Palatinate, Germany, Europe

Two Spotted Owlets (Athene brama) staring from their tree hole in Ranthambore Tiger Reserve, Ranthambore National Park, Rajasthan, India, Asia

Black Woodpecker (Dryocopus martius) at nest hole in a beech with chicks (Fagus sylvatica), Biosphaerenreservat Schwaebische Alb or Swabian Mountains Biosphere Reserve, UNESCO World Heritage Site, Baden-Wuerttemberg, Germany, Europe

Common starling (Sturnus vulgaris) feeding young bird at breeding cavity, North Rhine-Westphalia, Germany, Europe

Atlantic puffin (Fratercula arctica) on sea cliff top and flying gannets in seabird colony, Shetland Islands, Scotland, UK

Aerial view of n (Morus bassanus) on the breeding rock Langanes with coast, Langanesbyggo, Norourland eystra, Iceland, Europe

Atlantic puffin (Fratercula arctica) on sea cliff top watching gannet flying by in seabird colony, Scotland, UK

Atlantic puffin (Fratercula arctica) on sea cliff top and great skua chasing gannet in seabird colony, Shetland Islands, Scotland, UK

Great crested grebe (Podiceps cristatus) at the nest with young bird in plumage, Oldenburger Muensterland, Vechta, Lower Saxony, Germany, Europe

Flying great cormorant (Phalacrocorax carbo) with nesting material building a nest, Lembruch, Lower Saxony, Germany, Europe

Great crested grebe (Podiceps cristatus) copulating at the nest, Oldenburger Muensterland, Vechta, Lower Saxony, Germany, Europe

Southern Masked-Weaver or African Masked-weaver (Ploceus velatus), adult male weaving its nest, Madikwe National Park, South Africa

Southern Masked-Weaver or African Masked-weaver (Ploceus velatus), adult male hanging beneath its nest, displaying, Madikwe National Park, South Africa

Golden-fronted Woodpecker (Melanerpes aurifrons), male at nesting cavity in palm tree, Brownsville, Rio Grande Valley, South Texas, USA

Northern gannet (Morus bassanus) on the breeding rock Langanes, Langanesbyggo, Norourland eystra, Iceland, Europe

Middle spotted woodpecker (Dendrocopos medius), with food in its beak at the breeding cavity, North Rhine-Westphalia, Germany, Europe

Northern gannet (Morus bassanus), in flight with nesting material, Heligoland, Schleswig-Holstein, Germany, Europe

Two Puffins (Fratercula arctica), standing in the grass, bird rock Latrabjard, Westfjords, Iceland, Europe

Puffin (Fratercula arctica), standing in the grass, bird rock Latrabjard, Westfjords, Iceland, Europe

Hoopoe (Upupa epops), adult bird feeds young birds at the breeding cave in the tree, worm in the beak, Saxony-Anhalt, Germany, Europe

Puffin (Fratercula arctica), standing on grass, calling, bird rock Latrabjard, Westfjords, Iceland, Europe

Northern gannet (Morus bassanus), animal pair at greeting, animal portrait, Lummenfelsen, Heligoland, Schleswig-Holstein, Germany, Europe

Black-browed Albatross (Thalassarche melanophris) chick on its nest, Saunders Island, Falkland Islands, South America

African penguin (Spheniscus demersus), adult, looks from breeding cave, beach, on land, Boulders Beach, Simon's Town, Western Cape, South Africa, Africa

African penguin (Spheniscus demersus), adult, group, on land, on the beach, running, Betty's Bay, Stony Point Nature Reserve, Western Cape, South Africa, Africa

Northern gannet (Morus bassanus) on the breeding rock Langanes with yellow lichens on rocks, Langanesbyggo, Norourland eystra, Iceland, Europe