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

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

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

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

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

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

Bluetit hungry young nestling bird cheeping 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

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

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

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