Todd Mintz / Snowy owl (Bubo scandiaca) sitting in the distance on snow covered railway tracks, Saskatchewan, Canada.
01348758
Eric Baccega / Melting ice at Floe Edge, Arctic Bay, Baffin Island, Nunavut, Canada, April 2009.
01313261
Steven Kazlowski / Polar bear (Ursus maritimus) footprints in the snow along a barrier island during autumn freeze up, Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, Alaska. October 2009
01529939
Pascal Tordeux / Tyre tracks in sand on beach as low tide, Crotoy, Somme Bay, Pas de Calais, France, July 2015.
01470724
Floris van Breugel / Mount Rainier at sunset, seen from the summit of Old Snowy Mountain in the Goat Rocks Wilderness of the Cascades in Washington, USA. July 2012.