Tim Laman / Cape / Pintado petrel (Daption capense) in flight over the ocean, Antarctica, January

David Tipling / Close up of side of iceberg showing layers of compacted blue ice, Southern Ocean, off Antarctica, October

Ingo Arndt / Saline lake in winter, Amarga Lagoon, Torres del Paine National Park, Patagonia, Chile

Konrad Wothe / Grey heron (Ardea cinerea) flying head on in winter, Usedom, Germany, January

Bernard Castelein / Ice and stream, Belgium

Jeff Foott / Hoarfrost in winter, Arches National Park, Utah

Ingo Arndt / Mountain forest in clouds in winter, Valais, Switzerland

Ingo Arndt / Mountain in winter, Rinderhorn, Alps, Valais, Switzerland

Ingo Arndt / Lake in winter, Goic Lagoon, Torres del Paine National Park, Patagonia, Chile

Shane P. White / River in winter, Grundarfjordur, Iceland

Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) camouflaged in winter, Alberta, Canada

Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) camouflaged in winter, Alberta, Canada