Stefan Christmann / Emperor penguin (Aptenodytes forsteri), four journeying across sea ice to feed young. Atka Bay, Antarctica. August.

Frederique Olivier / Emperor penguins (Aptenodytes forsteri) walking in blizzard, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguins (Aptenodytes forsteri) walking and tobogganing in blizzard, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) tobogganing on an iceberg at sunset and diving from the edge, seen from a moving boat, Antarctica.

Tui De Roy / Emperor penguin (Aptenodytes forsteri) tobogganing, Amanda Bay, Prydz Bay, Ingrid Christensen Coast, East Antarctica, November.

Kevin Schafer / Emperor Penguin (Aptenodytes forsteri) tobogganing on sea ice at sunset, Weddell Sea, Antarctica

Frederique Olivier / Young Emperor penguins (Aptenodytes forsteri) jumping off ice floes, Antarctica, February 2011.

Solvin Zankl / King penguin {Aptenodytes patagonicus} portrait sliding on ice 'tobogganing', Falkland Islands.

Tui De Roy / Emperor Penguin (Aptenodytes forsteri) group tobogganing across vast distance of fast ice to nesting rookery, Kloa Point, Edward VIII Gulf, Antarctica

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) three adults toboganning, Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) adult toboganning next to chick, Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) toboganning, Atka Bay, Queen Maud Land, Antarctica. October.