Rod Williams / Hoverfly/Sun Fly (Helophilus pendulus) feeding on dog rose Lewisham, London, England, UK, June.

Ernie Janes / Man walking dogs on Dunwich beach, Suffolk, August.

Laurent Geslin / Blizzard on the ice pack of Manitoba with panhelion sun effects (sun dog) on the horizon. Northern Canada

Mark Hamblin / 2020VISION / Sun dog or Parhelion, Cairngorms NP, Scotland, UK, December 2010

Ben Hall / 2020VISION / Man walking his dog along a path through woodland with the sun shining through trees, Beacon Hill Country Park, The National Forest, Leicestershire, UK, October 2011

Jeff Wilson / 'Sun Dog', or Parhelion, caused by refraction of the sun's rays, more commonly seen in Antarctica, above glacier, Dry Valleys, Antarctica, December 2009. Taken on location for the BBC series, Frozen P...

Jeff Wilson / Sun Dog, or Parhelion, visible over tent of film crew, caused by refraction of the sun's rays, more commonly seen in Antarctica, above glacier, Dry Valleys, Antarctica, December 2009. Taken on locatio...

Bryan and Cherry Alexander / Chukchi hunters travelling from Uelen to Dezhnovka by dog sled on a windy November day. Uelen, Chukotka, Siberia, 2006. 40 BELOW bookplate.

Bryan and Cherry Alexander / Inuit hunter travelling by dog sled under midnight sun. Igloolik, Nunavut, Canada, June 1992.

Aflo / ic-04305 Golden retriever coming out of sea at sunset

Uri Golman / Local hunter and dog team resting on the sea ice near Ittoqqortoormiit, Scoresbysund, North East Greenland. March 2009.

Colin Monteath / Siberian Husky (Canis familiaris) resting in polar midnight light, Greenland