Adelie penguin (Pygoscelis adeliae), Port Lockroy research station, Antarctica, Polar Regions

Adelie penguin (Pygoscelis adeliae), Port Lockroy research station, Antarctica, Polar Regions

Adelie penguins (Pygoscelis adeliae), Port Lockroy research station, Antarctica, Polar Regions

Adelie penguins (Pygoscelis adeliae), Port Lockroy research station, Antarctica, Polar Regions

Adelie penguin (Pygoscelis adeliae), Port Lockroy research station, Antarctica, Polar Regions

Adult gentoo penguin (Pygoscelis papua), porpoising for swimming speed near the Antarctic Peninsula, Southern Ocean, Polar Regions

Adult Swallow-tailed gull (Creagrus furcatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult gentoo penguin (Pygoscelis papua), with very small white ocular patch at Brown Bluff near the Antarctica, Polar Regions

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

Adult light-mantled sooty albatross (Phoebetria palpebrata) on the wing in Elsehul on South Georgia, Southern Ocean, Polar Regions

Adelie penguin losing down feathers on ice, Antarctica, Polar Regions

Antarctic tern (Sterna vittata), on the wreck of the Guvernoren in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Antarctic tern (Sterna vittata), feeding in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Adult Adelie penguin (Pygoscelis adeliae), on ice at Booth Island, Antarctica, Polar Regions

Adult chinstrap penguin (Pygoscelis antarctica), at breeding colony at Half Moon Island, Antarctica, Polar Regions

Adult Subantarctic Skua (Catharacta antarctica lonnbergi) on tussac at Salisbury Plain on South Georgia Island, Polar Regions

Adult black-browed albatross (Thalassarche melanophrys), close up at nesting site on West Point Island, Falklands, South America

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

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

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

Adult reddish egret (Egretta rufescens) hunting for small fish in the shallow waters of Puerto Don Juan in the upper Gulf of California (Sea of Cortez), Baja California Norte, Mexcio.

Adult reddish egret (Egretta rufescens) hunting for small fish in the shallow waters of Puerto Don Juan in the upper Gulf of California (Sea of Cortez), Baja California Norte, Mexcio