Steven Kazlowski / Polar bear (Ursus maritimus) curious young male on the newly frozen pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska

Steven Kazlowski / Polar bear (Ursus maritimus) curious young male on the newly frozen pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska

Steven Kazlowski / Polar bear (Ursus maritimus) curious young male on the newly frozen pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska

Steven Kazlowski / Polar bear (Ursus maritimus) curious young male on the newly frozen pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska

Anup Shah / Lion (Panthera leo) male snarling at an inquisitve cub aged 2-3 months, Masai Mara National Reserve, Kenya, September

Anup Shah / Lion (Panthera leo) male snarling at inquisitve cubs aged 2-3 months, Masai Mara National Reserve, Kenya, September

Anup Shah / Lion (Panthera leo) male snarling at an inquisitve cub aged 2-3 months, Masai Mara National Reserve, Kenya, September

Jouan & Rius / Inquisitve Cape ground squirrel (Xerus inauris) investigating person writing, Kgalagadi Transfrontier Park, Kalahari desert, South Africa

Juergen Freund / Woman watching inquisitve Australian Sealions (Neophoca cinerea) Greenhead, Western Australia

Eric Baccega / Polar bear investigating tourist buggy {Ursus maritimus} Churchill, Manitoba, Canada

Neil Lucas / Husky dog {Canis familiaris} in sledge harness, Minnesota, USA

Aflo / ic-04908 Collie dog sitting, looking up with ears pricked - portrait.