Jami Tarris / Polar Bear (Ursus maritimus) cooling off, Spitsbergen, Svalbard, Norway

Mark Raycroft / Border Collie (Canis familiaris), North America

Frederique Olivier / Close-up of a Black browed albatross (Thalassarche melanophris) preening its chick, chick looks up panting, thermoregulating, West Point Island, Falkland Islands.

Jami Tarris / Bengal Tiger (Panthera tigris tigris) in waterhole, Ranthambore National Park, India

Mark Raycroft / English Bulldog (Canis familiaris) female running

Stefan Christmann / Emperor Penguin (Aptenodytes forsteri) colony huddling for warmth, Queen Maud Land, Antarctica

Stefan Christmann / Emperor Penguin (Aptenodytes forsteri) colony huddling for warmth, Queen Maud Land, Antarctica

Mark Raycroft / Chow Chow (Canis familiaris)

Mark Raycroft / Pembroke Welsh Corgi (Canis familiaris) pair

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) group huddles for warmth as they sleep, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) male warming himself in the sun, vulnerable, Madagascar

Matthias Breiter / Polar Bear (Ursus maritimus) cooling off on a frozen lake, Churchill, Manitoba, Canada