A pair of adult southern fulmars (Fulmarus glacialoides), on nest at Peter I Island in the Bellingshausen Sea, Antarctica, Polar Regions

An adult streaked weaver (Ploceus manyar) weaving its nest in grass, Yala National Park, Sri Lanka, Asia

An adult great horned owl (Bubo virginianus), sitting on the nest in Madera Canyon, southern Arizona, Arizona, United States of America, North 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

Man kneeeling to take a photo of an adult female green sea turtle (Chelonia mydas), coming ashore to nest on Isla Espiritu Santo, Sea of Cortez, Mexico, North America

An adult brown skua (Stercorarius antarcticus), harassing a gentoo penguin on Barrientos Island, Antarctica, Polar Regions

Black-Legged Kittiwake (Rissa tridactyla) adult feeding a chick on the nest, Iceland, Polar Regions

Adult red-billed tropicbird (Phaethon aethereus) in flight at nest site on Isla San Pedro Martir, Baja California, Mexico, North America

Adult gentoo penguin (Pygoscelis papua) on nest with chicks at Gold Harbor, South Georgia Island, Polar Regions

Adult imperial shag (Phalacrocorax atriceps) landing at nest site on New Island, Falkland Islands, U.K. Overseas Protectorate, South America

Adult yellow-rumped cacique (Cacicus cela), at nest site on Belluda Cano, Amazon Basin, Loreto, Peru.

An adult Andean gull (Chroicocephalus serranus), with chick near its nest, Andean Central Volcanic Zone, Chile, South America

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

An adult female green sea turtle (Chelonia mydas), coming ashore to nest on Isla Espiritu Santo, Sea of Cortez, Mexico, North America

Adult female green sea turtle (Chelonia Mydas), coming ashore at night to nest, Rekawa Beach, Sri Lanka, Asia

Adult jabiru stork (Jabiru mycteria), on a nest near Pouso Allegre, Mata Grosso, Pantanal, Brazil, South America

An adult female green sea turtle (Chelonia mydas), coming ashore to nest on Isla Espiritu Santo, Sea of Cortez, Mexico, North America

Adult gentoo penguin (Pygoscelis papua) on nest with chicks at Gold Harbor, South Georgia Island, Polar Regions

Adult kelp gulls (Larus dominicanus), on a nest on Annenkov Island, South Georgia, South Atlantic, Polar Regions

An adult streaked weaver (Ploceus manyar) weaving its nest in grass, Yala National Park, Sri Lanka, Asia

Adult osprey (Pandion haliaetus), on nest built over the years, Isla Rasa, Baja California, Mexico, North America

Black-Legged Kittiwake (Rissa tridactyla) adult and chick on the nest, Iceland, Polar Regions

Adult jabiru stork (Jabiru mycteria), on a nest near Pouso Allegre, Mata Grosso, Pantanal, Brazil, South America

Adult red-billed tropicbird (Phaethon aethereus), in flight near nest at Isla San Pedro Martir, Baja California, Mexico, North America

Adult black-legged kittiwakes (Rissa tridactyla), fighting at nest site on the cliffs at southern Bjornoya, Svalbard, Norway, Europe

An adult imperial shag (Leucocarbo atriceps), returning to the nesting colony with nest material, Ushuaia, Argentina, South America

Adult gentoo penguin (Pygoscelis papua) on nest with chicks at Gold Harbor, South Georgia Island, Polar Regions

Adult black-browed albatross (Thalassarche melanophris), on its nest on Saunders Island, Falkland Islands, South America

Black-Legged Kittiwake (Rissa tridactyla) adult and two chicks on the nest, Iceland, Polar Regions

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

Woman smiling showing the typical colors of the island, The Nest, Antigua, Antigua and Barbuda, Leeward Islands, West Indies, Caribbean, Central America

Adult Gentoo penguin (Pygoscelis papua) and chick on nest, with mountains and glaciers in background, Antarctic Peninsula, Antarctica, Polar Regions

Adult Gentoo penguin (Pygoscelis papua) and chicks on nest, Neko Harbour, Antarctic Peninsula, Antarctica, Polar Regions

Adult Gentoo penguin (Pygoscelis papua) and chicks on nest, Neko Harbour, Antarctic Peninsula, Antarctica, Polar Regions

White stork, stork, ciconia ciconia, weissstorch, storch, female standing in its nest, spring, oetwil am see, zuerich, switzerland

White stork, stork, ciconia ciconia, weissstorch, storch, couple standing in its nest, courtship, spring, oetwil am see, zuerich, switzerland

White stork, ciconia ciconia, couple building its nest, spring, oetwil am see, zuerich, switzerland

White stork, ciconia ciconia, couple standing in its nest, courtship, spring, oetwil am see, zuerich, switzerland

Mute Swan, Hoeckerschwan, Cygnus olor, breeding, Switzerland

White stork, stork, ciconia ciconia, couple standing in its nest, courtship, spring, oetwil am see, zuerich, switzerland

White stork, stork, ciconia ciconia, mother and young standing in nest, spring, oetwil am see, zuerich, switzerland

Mute Swan, Hoeckerschwan, Cygnus olor, breeding, Switzerland

Mute swan (cygnus olor) adult turning eggs on nest, abbotsbury, uk

Mute swan (cygnus olor) adult on nest turning eggs, abbotsbury, uk

White stork, stork, ciconia ciconia, weissstorch, storch, mother and young standing in nest, spring, oetwil am see, zuerich, switzerland

White stork, ciconia ciconia, couple standing in its nest, spring, oetwil am see, zuerich, switzerland

European Hoopoe (Upupa epops) adult at nest hole, Bulgaria

King cormorant (phalacrocorax atriceps) also known as cormorant or blue-eyed shag, falkland islands, adult gathering nesting in its beak.

Mute Swan, Hoeckerschwan, Cygnus olor, breeding, Switzerland

Mute Swan, Hoeckerschwan, Cygnus olor, breeding, Switzerland

Mute Swan, Hoeckerschwan, Cygnus olor, breeding, Switzerland

Mute Swan, Hoeckerschwan, Cygnus olor, breeding, Switzerland

White Storks (Ciconia ciconia) nesting on electricity pylons in the Coto Donana in Andalucia, Spain.

Newly hatched blue tit chicks and adult in a nestbox

Adult Adelie Penguin (Pygoscelis adeliae) stealing rocks for a nest near the Antarctic Peninsula.

An adult Leucistic Gentoo penguin (Pygoscelis papua) nesting and incubating two eggs at Gabriel Gonzales Videla Research Station, Antarctica

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

Adult ringed plover (Charadrius hiaticula) faking a broken wing in order to divert attention away from it's nest on the ground. Lovund, Norway in the Norwegian Sea.

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

Adult Adelie penguin (Pygoscelis adeliae) inspecting a non-viable egg at Devil Island, Antarctic Peninsula. Adelie penguins are truly an ice dependant penguin species.

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

Adult ringed plover (Charadrius hiaticula) faking a broken wing in order to divert attention away from it's nest on the ground. Lovund, Norway in the Norwegian Sea.

Adult Antarctic Shag, (Phalacrocorax (atriceps) bransfieldensis) from breeding colony on the Antarctic Peninsula

Blue-footed booby (Sula nebouxii) newly hatched chick in the Galapagos Island Archipelago, Ecuador

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

An adult Leucistic Gentoo penguin (Pygoscelis papua) nesting and incubating two eggs at Gabriel Gonzales Videla Research Station, Antarctica

Adult Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Group, Ecuador. This raptor species is endemic to the Galapagos Islands. Pacific Ocean.

Adult Antarctic Shag, (Phalacrocorax (atriceps) bransfieldensis) from breeding colony on the Antarctic Peninsula

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

Antarctic Shag (Phalacrocorax (atriceps) bransfieldensis) returning to nest with kelp on breeding colony on Petermann Island on the west side of the Antarctic Peninsula

Adult whooper swan (Cygnus cygnus) pair on nest near Lake Myvatn, Iceland

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.

Adult great skua (Stercorarius skua) being dive-bombed by defensive arctic terns (Sterna paradisaea) guarding their nest sites in the Svalbard Archipelago, Norway

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

Adult Adelie penguin (Pygoscelis adeliae) stealing a rock from a neighbors nest on breeding colony on Petermann Island, Antarctica

Adult whooper swan (Cygnus cygnus) pair on nest near Lake Myvatn, Iceland

Adult female green sea turtle (Chelonia mydas) hauled out and laying eggs on Ascension Island, south Atlantic Ocean

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

Chinstrap penguin (Pygoscelis antarctica) chick head detail at colony on Useful Island near the Antarctic Peninsula. There are an estimated 2 million breeding pairs of chinstrap penguins in the Antarctic peninsula region alone, perhaps as many as 7.5 million breeding pairs in all of Antarctica. Their name derives from the narrow black band under their heads which makes it appear as if they are wearing black helmets, making them one of the most easily identified types of penguin. Other names for them are "Ringed Penguins", "Bearded Penguins", and "Stonecracker Penguins" due to their harsh call. They grow to 68 cm (27 in). The average adult weight of a Chinstrap Penguin is 4.5 kg (10 lbs). Weight can range from 3 to 6 kg (6.6-13.2 lbs), with males being slightly larger and weight varying based on where the penguin is in the breeding cycle. Their diet consists of krill, shrimp, and fish. On land they build circular nests from stones, and lay two eggs, which are incubated by both the male and the female for shifts of five to ten days. They can also breed on icebergs, though they prefer non-icy conditions. The chicks hatch after about 35 days, and have fluffy gray backs and white fronts. The chicks stay in the nest for 20?30 days before they go to join a creche. At around 50?60 days old, they moult, gaining their adult plumage and go to sea. The Chinstrap Penguin was first described by German naturalist Forster in 1781. Its specific epithet was often seen as antarctica, however a 2002 review determined the genus Pygoscelis was masculine, and hence the correct binomial name is Pygoscelis antarcticus.

Adult ringed plover (Charadrius hiaticula) faking a broken wing in order to divert attention away from it's nest on the ground. Lovund, Norway in the Norwegian Sea.

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.

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

Black Guillemot (Cepphus grylle) pair sitting in a drain pipe that they are nesting in, one bird is calling. Black Guillemots nest in drains and holes in the sea wall in the middle of Oban town centre. Argyll Scotland, UK

Black Guillemot (Cepphus grylle) circling in a paring/mating ritual in the middle of Oban Bay with boats in the background. Black Guillemots nest in drains and holes in the sea wall in the middle of Oban town centre. Argyll, Scotland, UK

Black Guillemot (Cepphus grylle) standing in a wall that a pair are nesting in. Black Guillemots nest in drains and holes in the sea wall in the middle of Oban town centre. Argyll, Scotland, UK

Black Guillemot (Cepphus grylle) sitting in a drain pipe that a pair are nesting in. Black Guillemots nest in drains and holes in the sea wall in the middle of Oban town centre. Argyll, Scotland, UK

Black Guillemot (Cepphus grylle) pair sitting in a drain pipe that they are nesting in. Black Guillemots nest in drains and holes in the sea wall in the middle of Oban town centre. Argyll, Scotland, UK

Black Guillemot (Cepphus grylle) sitting in a wall that a pair are nesting in. Black Guillemots nest in drains and holes in the sea wall in the middle of Oban town centre. Argyll, Scotland, UK

Black Guillemot (Cepphus grylle) standing in a drain pipe that a pair are nesting in. Black Guillemots nest in drains and holes in the sea wall in the middle of Oban town centre. Argyll Scotland, UK

Black Guillemot (Cepphus grylle) taking off in the middle of Oban Bay with boats in the background. Black Guillemots nest in drains and holes in the sea wall in the middle of Oban town centre. Argyll Scotland, UK (RR)

Gentoo penguin (Pygoscelis papua) nesting near whalebone, Aitcho Island, Antarctica, Southern Ocean.

Macaroni penguins (Eudyptes chrysolophus) Nesting amoungst tussock and snow, South Georgia Island, Antarctica, Southern Ocean.

Macaroni penguins (Eudyptes chrysolophus) Nesting amoungst tussock and snow, South Georgia Island, Antarctica, Southern Ocean.

Black Guillemot (Cepphus grylle) flying in the middle of Oban Bay with boats in the background. Black Guillemots nest in drains and holes in the sea wall in the middle of Oban town centre. Argyll Scotland, UK

Black Guillemot (Cepphus grylle) taking off in the middle of Oban Bay with boats in the background, in the rain. Black Guillemots nest in drains and holes in the sea wall in the middle of Oban town centre. Argyll Scotland, UK

Macaroni penguins (Eudyptes chrysolophus) Nesting amoungst tussock, South Georgia Island, Antarctica, Southern Ocean.

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

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

Southern Royal Albatross (Diomedea Epomophora) sitting in nest with its chick. Campbell Island, Subantarctic New Zealand.