Guy Edwardes / Icicles on frozen Slap Pericnik, Vrata Valley, Gorenjska, Triglavski National Park, Julian Alps, Slovenia, January 2006

Mark Jones / Adelie Penguin (Pygoscelis adeliae) adult, Ross Sea, Antarctica

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

Ingo Arndt / Cracks in clear ice of Lake Baikal, Siberia, Russia. February.

Ingo Arndt / Ice crystals on icicles. Lake Baikal, Siberia, Russia. February.

Ingo Arndt / Ice formations on Lake Baikal at sunset. Siberia, Russia. February 2019.

Jeff Foott / Icicles and rock formation, Arches National Park, Utah

Guy Edwardes / Icicles at Pericnik waterfall, Triglav National Park, Julian Alps, Slovenia.

Guy Edwardes / Pericnik waterfall, frozen in winter, Triglav National Park, Julian Alps, Slovenia.

Guy Edwardes / Frozen waterfall, Slap Pericnik, Gorenjska, Vrata Valley, Slovenia.

John Cancalosi / Icicles melting, Montgomery County , Maryland, USA, January 2019.

Ashley Cooper / Mountaineer, Mike Withers ice climbing in Fisher Place gill above Thilrmere, Lake District, UK. This waterfall very rarely comes into climbable condition, but did so in January 2010