Jami Tarris / Polar Bear (Ursus maritimus) on shore, Spitsbergen, Svalbard, Norway

Marie Read / Loggerhead shrike (Lanius ludovicianus) on an ice-covered fence after an ice storm, Anahuac National Wildlife Refuge, Texas, USA. January.

Guy Edwardes / Buachaille Etive Mor in winter, Rannoch Moor, Highlands, Scotland, UK. January 2015.

Sven Zacek / Pink algae in fresh snow on the coast of the Baltic Sea, Lahemaa National Park, Northern Estonia. December 2012.

David Pattyn / Alpine ibex (Capra ibex) male in deep snow with icicles behind, Gran Paradiso National Park, Italy. December

Bryan and Cherry Alexander / Icicles hanging from the edge of a small blue iceberg as the summer thaw sets in, Antarctica

Olga Kamenskaya / Ice splash out formation with icicles, Lake Baikal, Siberia, Russia, March

Ben Cranke,Ben Cranke / Gentoo Penguin (Pygoscelis papua) group travelling out to sea, Cuverville Island, Antarctic Peninsula, Antarctica

Brent Stephenson / A large hole in an iceberg with icicles hanging. Yalour Islands, Antarctic Peninsula, Antarctica, December.

Rolf Nussbaumer / Chipping Sparrow (Spizella passerina) adult on ice covered Possum Haw Holly (Ilex decidua) berries. New Braunfels, San Antonio, Hill Country, Central Texas, USA, January.

Markus Varesvuo / Crested tit (Lophophanes cristatus) perched on frosted twig. Posio, Finland, January.

Bryan and Cherry Alexander / Icicles hanging from a ledge on an iceberg, Antarctica, October 2006.