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Adult king penguins (Aptenodytes patagonicus) returning from sea to the nesting colony at Salisbury Plain, South Georgia, Polar Regions

Adult king penguins (Aptenodytes patagonicus) returning to sea from the nesting colony at Salisbury Plain, South Georgia, Polar Regions

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

Sunrise on king penguins (Aptenodytes patagonicus) at nesting and breeding colony at Salisbury Plain, South Georgia, Polar Regions

Adult gentoo penguins (Pygoscelis papua), returning and coming from the sea at Booth Island, Antarctica, Southern Ocean, Polar Regions

Blue-footed boobies (Sula nebouxii), on a small islet near Isla Salsipuedes, Baja California, Sea of Cortez, Mexico, North America

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

A Black Browed Albatross (Thalassarche melanophris) sitting on a nest in a mixed nesting colony of albatross's and Rockhopper Penguins (Eudyptes chrysocome) on Westpoint island in the Falkland Islands off argentina, in South America. Albatrosses are globally thratened by long line fishing boats who are responsible for killing thousands of birds.

Rockhopper Penguins (Eudyptes chrysocome) washing in a stream on Westpoint island in the Falkland Islands off argentina, in South America. Numbers off rocxkhoppers have declined substantially, partly due to competition with commercial fishing and partly due to climate change, which causes their prey food to migrate to cooler waters.

A pair of Black Browed Albatross (Thalassarche melanophris) Allopreening to reinforce the pair bond in a nesting colony on Westpoint island in the Falkland Islands off Argentina, in South America. Albatrosses are globally thratened by long line fishing boats who are responsible for killing thousands of birds.

A pair of Black Browed Albatross (Thalassarche melanophris) Allopreening to reinforce the pair bond in a nesting colony on Westpoint island in the Falkland Islands off Argentina, in South America. Albatrosses are globally thratened by long line fishing boats who are responsible for killing thousands of birds.

A mixed Black Browed Albatross (Thalassarche melanophris) and Rockhopper Penguins (Eudyptes chrysocome) nesting colony on Westpoint island in the Falkland Islands off Argentina, in South America, being watched by a group on a wildlife tourist trip.

A Black Browed Albatross (Thalassarche melanophris) chick sitting on a nest in a mixed nesting colony of albatross's and Rockhopper Penguins

A Black Browed Albatross (Thalassarche melanophris) chick sitting on a nest in a mixed nesting colony of albatross's and Rockhopper Penguins

A Black Browed Albatross (Thalassarche melanophris) in a nesting colony of albatross's and Rockhopper Penguins (Eudyptes chrysocome) on Westpoint island in the Falkland Islands off argentina, in South America. Albatrosses are globally thratened by long line fishing boats who are responsible for killing thousands of birds.

A pair of Black Browed Albatross (Thalassarche melanophris) Allopreening to reinforce the pair bond in a nesting colony on Westpoint island in the Falkland Islands off argentina, in South America. Albatrosses are globally thratened by long line fishing boats who are responsible for killing thousands of birds.

Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador

King penguin (Aptenodytes patagonicus) with introduced reindeer at breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean.

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

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

Blue-footed booby (Sula nebouxii) plunge-diving underwater in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

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

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

Curious king penguin (Aptenodytes patagonicus) breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean.

Blue-footed booby (Sula nebouxii) plunge-diving underwater in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

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

Adult osprey (Pandion haliaetus) on nest on Isla Angel de la Guarda in the upper Gulf of California (Sea of Cortez) Baja California Norte, Mexico.

King penguin (Aptenodytes patagonicus) breeding and nesting colony at Salisbury Plains in the Bay of Isles, South Georgia, Southern Ocean.

Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador

Blue-footed booby (Sula nebouxii) in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

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

Elegant terns (Sterna elegans) nesting on tiny and remote Isla Rasa in the middle Gulf of California (Sea of Cortez), Baja California Norte, Mexico

Wild Slaty-backed Gull (Larus schistisagus) , nesting, Tyuleniy Island, Russia, Asia MORE INFO: Gulls circle the Kittywakes colony in hope that if they fly, the gulls can swoop in and grab their exposed eggs

Swallow (Hirundo rustica) chicks in nestSwallow (Hirundo rustica) chicks in nest. Loch Awe, nr Oban, Scotland, UK

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

Komodo dragon (Varanus komodoensis) - female resting after tunneling in megapode mount above her nest chamber.

Cameraman, Mike Pitts, holding Komodo dragon hatchling. Scene behind showing entrance in the megapode mound to film the underground nest.

Young hatchling Komodo dragon (Varanus komodoensis). one of thirty three eggs only twenty eight hatched.

Female Komodo dragon (Varanus komodoensis) entering one of entrances to her nest chamber in a megapode mound.

One of many entrances to megapode mound containing Komodo dragon egg chamber. Film crew found the nest the very day the eggs hatched after 9 month gestation. Young hatchling Komodo dragons (Varanus komodoensis) and their egg cases.

One of many entrances to megapode mound containing Komodo dragon egg chamber. Film crew found the nest the very day the eggs hatched after 9 month gestation. Young hatchling Komodo dragons (Varanus komodoensis) and their egg cases.

Komodo dragon (Varanus komodoensis) - female resting and defending one of six entrances to megapode mound

Young hatchling Komodo dragon (Varanus komodoensis). one of thirty three eggs only twenty eight hatched.

Komodo dragon hatching from egg (Varanus komodoensis) Komodo Is Indonesia. Eggs are laid underground, here under megapode mound.

Young hatchling Komodo dragon (Varanus komodoensis). one of thirty three eggs only twenty eight hatched.

Blue-footed booby (Sula nebouxii) plunge-diving underwater in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador

Elegant terns (Sterna elegans) nesting on Isla Rasa in the middle Gulf of California (Sea of Cortez), Mexico

Adult brown noddy (Anous stolidus) pair nesting on cliff face of Champion Island in the Galapagos Island Group. Champion Island is a nesting and breeding area for brown noddies, Pacific Ocean.

Adult osprey (Pandion haliaetus) on nest on tiny Isla Rasa in the upper Gulf of California (Sea of Cortez) Baja California Norte, Mexico.

Hawksbill turtle (Eretmochelys imbricata) - adult female returning to sea after laying eggs in the sand. Bird Island, Seychelles, Indian Ocean (RR)

Adult osprey (Pandion haliaetus) on nest at Isla Rasa in the Gulf of California (Sea of Cortez) Baja California Sur, Mexico.

Komodo dragon hatchling emerging, Komodo Island, Indonesia. Eggs are laid underground, in this case under a megapode mound, and so hatchlings have to dig themselves out.

King penguin (Aptenodytes patagonicus) adult and chick at breeding and nesting colony at Salisbury Plains in the Bay of Isles, South Georgia, Southern 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.

Blue-footed booby (Sula nebouxii) plunge-diving underwater in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

King penguins (Aptenodytes patagonicus) swimming near the beach at breeding and nesting colony at Salisbury Plains in the Bay of Isles, South Georgia, Southern 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.

Avian pox outbreak at the king penguin (Aptenodytes patagonicus) breeding and nesting colony at Salisbury Plains, Bay of Isles on South Georgia Island, Southern Ocean.

Blue-footed booby (Sula nebouxii) pair on Punta Suarez on Espanola Island in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

Swallow (Hirundo rustica) chicks in nestSwallow (Hirundo rustica) chicks in nest. Loch Awe, nr Oban, Scotland, UK

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

2008; A nesting Ruddy Turnstone (Arenaria interpres) in breeding plumage. Tymna Lagoon, Chukotskiy Peninsular, Russia, Asia

Swallow (Hirundo rustica) chicks in nestSwallow (Hirundo rustica) chicks in nest. Loch Awe, nr Oban, Scotland, UK

Adult Gentoo Penguin (Pygoscelis papua) sitting on nest with one hatched chicken and one still being in egg. Cuverville Island, Antarctica

Galapagos penguin (Spheniscus mendiculus) hauled out on Isabela Island in the Galapagos Island Archipelago, Ecuador

Black-legged Kittiwakes (Rissa tridactyla) on nesting cliffs at the South Marble Islands in Glacier Bay National Park, Southeast Alaska, USA

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

Blue-footed booby (Sula nebouxii) pair on Punta Suarez on Espanola Island in the Galapagos Island Group, Ecuador. The Galapagos are a nesting and breeding area for blue-footed boobies.

Komodo dragon (Varanus komodoensis) - female resting after tunneling in megapode mount above her nest chamber.

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