Andy Sands / Oxlips (Primula eliator) growing among Wood Anemones (Anemone nemorosa) good indicators of ancient woodland, Suffolk, England, UK, April

Michael Hutchinson / Tracking shot of Wood anemones (Anemone nemorosa) flowering in woodland, Bristol, England, UK, April.

Ross Hoddinott / Wood anemone flower (Anemone nemorosa), RHS Rosemoor, near Great Torrington, Devon, UK. April 2017.

Ole Jorgen Liodden / White anemone (Anemone nemorosa) against pink background, Ringerike, Norway, May.

Sandra Bartocha / Wood anemones (Anemone nemorosa) flowering in European beech (Fagus sylvatica) forest, Neubrandenburg, Germany, April.

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

Laurent Geslin / Urban Red fox sniffing the air {Vulpes vulpes} London, UK

Laurent Geslin / Urban Red fox sniffing the air {Vulpes vulpes} London, UK

Cyril Ruoso / Komodo Dragon (Varanus komodoensis) using tongue to smell, Komodo National Park, Indonesia

Benjamin Barthelemy,Benjamin Barthelemy / Wood anemone (Anemone nemorosa) in flower, Lorraine Regional Natural Park, Lorraine, France, March

Benjamin Barthelemy,Benjamin Barthelemy / Wood anemone (Anemone nemorosa) in flower, Vallee des Cailles, Eure-et-Loir, France, April.

Denis-Huot,Denis-Huot / Lion (Panthera leo) male using 'flehmen response' to smell, Masai-Mara Game Reserve, Kenya. Vulnerable species.