Tui De Roy / Stewart Island Brown Kiwi or Southern Tokoeka (Apteryx australis lawryi), female probing by scent for sand hoppers in rotting kelp beach wrack at night, Ocean Beach, Stewart Island, New Zealand

Nick Upton / Slow worm (Anguis fragilis) moving through coastal grassland, flicking its tongue to pick up scents, Cornwall, UK, May.

Ammonite / Baird's tapir (Tapirus bairdii) smelling the air, footage taken at night using starlight camera technology, Santa Rosa National Park, Costa Rica.

Ammonite / Baird's tapir (Tapirus bairdii) smelling the air, footage taken at night using thermal camera technology, Santa Rosa National Park, Costa Rica.

Christophe Courteau / Pack of African wild dogs (Lycaon, pictus) smelling a scent on a trail, Mala Mala Game Reserve, South Africa, June.

Steven Kazlowski / Polar bear (Ursus maritimus) adult scents the air as it travels the coast along Spitsbergen in search of food, northwestern coast of the Svalbard Archipelago, Norway, Greenland Sea, July

Anup Shah / Banded mongooses (Mungos mungo) with heads inclined skywards, and checking territory boundaries, Masai Mara National Reserve, Kenya. March.

Steven Kazlowski / Polar bear (Ursus maritimus) adult scents the air as it sits next to a Bowhead whale {Balaena mysticetus} bone, off Barter Island and the 1002 area of the Arctic National Wildlife Refuge, Alaska

Tim Fitzharris / Prairie Rattlesnake (Crotalus viridis viridis) coiled, using its tongue to collect scents, North America

Roy Mangersnes / European lynx (Lynx lynx) courtship behaviour. Male smelling female scents, Norway, captive. March

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) buck smelling branches, possibly to detect scents left by other Deer

Jaymi Heimbuch / Samples of scents used in training for scent detection dogs with Conservation Canines, northeast Washington