Stefan Christmann / Adelie penguin (Pygoscelis adeliae) calling during courtship, Atka Bay, Queen Maud Land, Antarctica, December.

Stefan Christmann / Adelie penguin (Pygoscelis adeliae) nesting pair, Atka Bay, Queen Maud Land, Antarctica, December.

Frederique Olivier / Adelie penguins (Pygoscelis adeliae) swimming underneath sea ice, Antarctica.

Frederique Olivier / Group of Adelie penguins (Pygoscelis adeliae) swimming in a tide crack, lots jump out, Adelie Land, Antarctica, January.

Frederique Olivier / Wide angle shot of Adelie penguins (Pygoscelis adeliae) walking on sea ice, Adelie Land, Antarctica, January.

Frederique Olivier / Group of Adelie penguins (Pygoscelis adeliae) destroying an egg with a chick inside, Adelie Land, Antarctica, January.

Frederique Olivier / Adelie penguins (Pygoscelis adeliae) walking in front of a blue iceberg, Adelie Land, Antarctica, January.

Frederique Olivier / Adelie penguin (Pygoscelis adeliae) stealing rock from another penguin for its nest, Adelie Land, Antarctica, January.

Frederique Olivier / Group of Adelie penguins (Pygoscelis adeliae) diving from the edge of the sea ice, Antarctica.

Frederique Olivier / Pair of Adelie penguins (Pygoscelis adeliae) displaying to one another, Antarctica.

Frederique Olivier / Group of Adelie penguins (Pygoscelis adeliae) walking away from the camera on sea ice at sunset, with one solitary penguin in the foreground, Antarctica.

Frederique Olivier / Group of Adelie penguins (Pygoscelis adeliae) running and gathered on sea ice, Antarctica.