Chinstrap penguin (Pygoscelis antarctica) breeding and molting at Half Moon Island, Antarctica, Southern Ocean, Polar Regions

Gentoo penguin (Pygoscelis papua) breeding colony at Petermann Island, Antarctica, Southern Ocean, Polar Regions

Imperial Shags (Phalacrocorax (atriceps) atriceps) at breeding colony on small islets off the city of Ushuaia, Argentina, South America

Adelie penguins (Pygoscelis adeliae), at breeding colony at Brown Bluff on the eastern side of the Antarctic Peninsula, Antarctica, Polar Regions

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

Adult Imperial Shag (Phalacrocorax (atriceps) atriceps) returning to the colony with nesting material, Falkland Islands

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

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

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

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

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

Gentoo penguin (Pygoscelis papua) mating behavior at Jougla Point on Wiencke Island, Antarctica, Southern Ocean, Polar Regions

Gentoo penguin (Pygoscelis papua) mating behavior at Jougla Point on Wiencke Island, Antarctica, Southern Ocean, Polar Regions

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

Bluetit bird feeding hungry young nestling in a garden bird box, The Cotswolds, Oxfordshire, England, United Kingdom

Bluetit hungry young nestling bird cheeping in a garden bird box, The Cotswolds, Oxfordshire, England, United Kingdom

Bluetit bird feeding hungry young nestling in a garden bird box, The Cotswolds, Oxfordshire, England, United Kingdom

Bluetit hungry young nestling bird awaits feeding in a garden bird box, The Cotswolds, Oxfordshire, England, United Kingdom

Female mute swan building her nest, Donnington, Gloucestershire, United Kingdom

Female mute swan asleep on nest of moss and twigs, Donnington, Gloucestershire, The Cotswolds, England, United Kingdom