Francois Savigny / Bengal tiger portrait {Panthera tigris tigris} Bandhavgarh NP, Madhya Pradesh, India

Wim van den Heever / Lion (Panthera leo) male standing in cold and rain with strong wind blowing, smelling the air, Masai Mara National Reserve, Kenya

Wim van den Heever / Lion (Panthera leo) male in darkness, Okavango Delta, Botswana.

Uri Golman / Svalbard reindeer (Rangifer tarandus platyrhynchus) in velvet, resting, Svalbard, Norway, August.

Cyril Ruoso / Fig tree (Ficus sp) in rainforest, Bukit Barisan National Park, Sumatra, Indonesia.

Theo Webb / Male Indian peafowl (Pavo cristatus) displaying to attract a female, Bandhavgarh National Park, India.

Michel Roggo / Iceberg in the sea outside the Kangia Ilulissat Icefjord. Iceberg from the Sermeg Kujalleg Glacier, UNESCO World Heritage Site, Kalaallit Nunaat, Greenland, August 2014. Photographed for The Freshwate...

Andy Rouse / African lion (Panthera leo) on plains, Masai Mara, Kenya.

Andy Rouse / Red deer (Cervus elaphus) stag during rut, Wales, UK. September. Captive in deer park.

Steven Kazlowski / Photographer in front of Northern lights / Aurora borealis glowing brightly over the frozen eastern Beaufort Sea, Arctic National Wildlife Refuge, Alaska Model released.

Floris van Breugel / Autumnal landscape with snow, Arrigetch Peaks region of Brooks Range, Gates of the Arctic National Park, Alaska, USA, August 2014.

Floris van Breugel / Aurora Borealis over yellow tent lit from within and mountainous scenery, Arrigetch Peaks, Gates of the Arctic National Park, Brooks Range, Alaska, USA, August 2014.