Tui De Roy / Emperor Penguin (Aptenodytes forsteri) pair on sea ice in midnight twilight, Ekstrom Ice Shelf, Weddell Sea, Antarctica

Tui De Roy / Emperor Penguin (Aptenodytes forsteri) group, Ekstrom Ice Shelf, Weddell Sea, Antarctica

Tui De Roy / Emperor Penguin (Aptenodytes forsteri) trio on sea ice in midnight twilight, Ekstrom Ice Shelf, Weddell Sea, Antarctica

Tui De Roy / Emperor Penguin (Aptenodytes forsteri) individual on sea ice in midnight twilight, Ekstrom Ice Shelf, Weddell Sea, Antarctica

Tui De Roy / Emperor Penguin (Aptenodytes forsteri) group commuting across sea ice to nesting colony, Ekstrom Ice Shelf, Weddell Sea, Antarctica

Flip de Nooyer / Glacier reaches the ocean, South Georgia Island

Konrad Wothe / Icebergs caught in frozen ice shelf, Weddell Sea, Antarctica

Tui De Roy / Emperor Penguin (Aptenodytes forsteri) parent feeding chick, Riiser-Larsen Ice Shelf, Weddell Sea, Antarctica

Norbert Wu / Norbert Wu photographing under the ice in Antarctica on shelf of an iceberg, brine channel stalactite and sea ice ceiling

Doug Allan / Ice cliffs of the Brunt Ice Shelf Weddell Sea Antarctica