Colin Varndell / Grass snake (Natrix natrix) Dorset, UK May

Matthew Maran / Grass snake (Natrix natrix) flicking tongue, Hampstead Heath, London, England, UK, August.

Luis Quinta / Grass snake (Natrix natrix) juvenile playing dead, Alvao, Portugal, April.

Luis Quinta / Grass snake (Natrix natrix) swimming in river, Olo, Alvao, Portugal, June.

Danny Green / Grass Snake (Natrix natrix) on lily pad, reflected in water. Leicestershire, UK, October.

Sven Zacek / Grass Snake (Natrix natrix) looking out from between wood slats. Estonia, Europe, June.

Robin Chittenden / Grass snake (Natrix natrix) swimming at surface, Dobrogea Tulcea, Danube Delta, Romania, May

Terry Whittaker / 2020VISION / Grass snake (Natrix natrix) swimming through water, Wicken Fen, Cambridgeshire, UK, June

Danny Green / 2020VISION / Grass Snake (Natrix natrix) coiled, basking, Staffordshire, England, UK, April

Danny Green / 2020VISION / Grass Snake (Natrix natrix) portrait, Staffordshire, England, UK, April

Solvin Zankl / Grass snake (Natrix natrix) head portrait flicking tongue

Paul Hobson / Grass snake (Natrix natrix) swimming amongst duck weed, Oxfordshire, UK

Edwin Giesbers / Shed skin of grass snake {Natrix natrix} on lilypad, Netherlands.

Edwin Giesbers / Grass snake {Natrix natrix} coiled, the Netherlands

Kim Taylor / Grass Snake (Natrix natrix) captive, Surrey, England

Andy Sands / Grass snake (Natrix natrix) basking on tree stump among Bluebells, Hertfordshire, England. UK

Andy Sands / Grass snake (Natrix natrix) feigning death, Hertfordshire, England. UK

Solvin Zankl / Grass Snake (Natrix natrix) beside Marsh marigold flower in riverine habitat, Germany

Tony Phelps / Grass snake {Natrix natrix} male with eyes glazed prior to moulting, Surrey, UK

Andy Sands / Grass snake {Natrix natrix} swimming, Captive, UK

Tony Phelps / Grass snake feigning death {Natrix natrix} Purbeck, Dorset, UK

George McCarthy / Grass snake {Natrix natrix} threatening Common toad {Bufo bufo} puffed up in defence, UK

Andrew Cooper / Grass Snake swimming, England (Natrix natrix) Devon

Chris Packham / Grass snake swimming in pond covered in pondweed, England,

Tony Phelps / Grass snake female feigning death - defensive behaviour, UK

Mike Wilkes / Grass snake guarding its eggs, UK

Artur Tabor / Grass snake eating Edible frog (Rana esculenta) Poland

George McCarthy / Grass snake {Natrix natrix} with Common toad {Bufo bufo} inflated in defense. UK

Mike Wilkes / Head of Grass Snake in grass (Natrix natrix) UK

Chris Packham / Grass snake on abandonned car bonnet

Andrew Cooper / Grass Snake head, England

Robert Valentic / Grass snake (Natrix natrix persa) basking in overcast weather, Evros River near Loutros, Greece, August. Controlled conditions.

Oliver Wright / Grass snake (Natrix natrix) coiled up amongst leaf litter. Skipwith Common National Nature Reserve, North Yorkshire, England, UK. April. Focus stacked image.

Fabio Pupin / Grass snake, (Natrix natrix), basking in cultivated habitat, Italy, April . Non-ex.

Fabio Pupin / Grass snake, (Natrix natrix), hunting in shallow water, Italy, June . Non-ex.

Fabio Pupin / Grass snake, (Natrix natrix), basking near stream, Italy, August . Non-ex.

Cyril Ruoso / Grass snake (Natrix natrix) sunbathing on log above water. Seine et Marne, Ile-de-France. May.

Cyril Ruoso / Red-eared slider (Trachemys scripta elegans) and Grass snake (Natrix natrix) basking on log. Seine et Marne, Ile-de-France. May.

Markus Varesvuo / Arctic tern (Sterna paradisaea) mobbing Grass snake (Natrix natrix) on rocks below. Uto, Western Finland. June.

Piotr Naskrecki / Grass Snake (Natrix natrix), Poland

Brian Bevan / Grass snake (Natrix natrix) swimming, hunting along stream edge, Carmarthenshire, Wales, UK, June. Captive.

Dave Bevan / Grass snake (Natrix natrix) pretending to be dead when threatened, Carmarthenshire, Wales, UK, June. Captive.

Dave Bevan / Grass snake (Natrix natrix) swimming against the current in a shallow stream, Carmarthenshire, Wales, UK, June. Captive.

Dave Bevan / Grass snake (Natrix natrix) moving through a field, Carmarthenshire, Wales, UK, June. Captive.

Stephen Dalton / Grass snake (Natrix natrix) basking at edge of garden lawn Sussex, England, UK, June.

Sylvain Cordier / Grass snake(Natrix natrix) coiled round eggs, Alsace, France

Sylvain Cordier / Grass snake(Natrix natrix) coiled round eggs, Alsace, France

Sylvain Cordier / Grass snake(Natrix natrix) coiled round eggs, Alsace, France

Sylvain Cordier / Grass snake (Natrix natrix) coiled round eggs, Alsace, France, July.

Andy Sands / Grass snake (Natrix natrix) basking on log in spring time, Surrey, England, UK, April

Andy Sands / Grass snake (Natrix natrix) tasting air with tongue in pond, Surrey, England, UK, April

Andy Sands / Grass snake (Natrix natrix) tasting air with tongue, Surrey, England, UK, April

Stephen Dalton / Grass snake (Natrix natrix) feigning death, defensive behaviour, Sussex, UK

Stephen Dalton / Grass snake (Natrix natrix) coiled up and using forked tongue to smell and taste the air, Sussex, UK

Stephen Dalton / Grass snake (Natrix natrix) basking in sunshine, Sussex, UK

Stephen Dalton / Grass snake (Natrix natrix) showing forked tongue, smelling and tasting the air, Sussex, UK

Stephen Dalton / Grass snake (Natrix natrix) moving across the ground, Sussex, UK

Pal Hermansen / European grass snake (Natrix natrix) swimming, Akershus, Norway, June.

Pal Hermansen / European grass snake (Natrix natrix) in water, Akershus Norway, June.

Matthew Maran / Young Grass snake (Natrix natrix) held in human hand, Hampstead Heath, London, England, UK, August.

Luis Quinta / Grass snake (Natrix natrix) swimming in river, Olo, Alvao, Portugal, June.

Luis Quinta / Grass snake (Natrix natrix) swimming in river, Olo, Alvao, Portugal, June.

Luis Quinta / Grass snake (Natrix natrix) adult swimming in river, Olo, Alvao, Portugal, June.

Luis Quinta / Grass snake (Natrix natrix) near river, Olo, Alvao, Portugal, June.

Luis Quinta / Grass snake (Natrix natrix) Alvao, Portugal, July.

Jussi Murtosaari / Grass snake (Natrix natrix) in habitat, Aland Islands, Finland, May.

Kerstin Hinze / Two grass snakes (Natrix natrix) curled up next to each other, Germany, August, captive.

Kerstin Hinze / Two grass snakes (Natrix natrix) curled up next to each other, Germany, August, captive.

Kerstin Hinze / Two grass snakes (Natrix natrix) Germany, August, captive.

Sven Zacek / Grass snakes (Natrix natrix) on top of a young spruce tree in Valgamaa, Estonia, September.

Sven Zacek / Grass snakes (Natrix natrix) two mating, Valgamaa, Estonia, April.

Sven Zacek / Grass snake (Natrix natrix) on tree trunk, Valgamaa, Estonia.

MYN / Tim Hunt / Grass snake (Natrix natrix) Barnt Green, Worcestershire, England, UK, June.

MYN / Tim Hunt / Grass snake (Natrix natrix) Barnt Green, Worcestershire, England, UK, June.

MYN / Tim Hunt / Grass snake (Natrix natrix) Barnt Green, Worcestershire, England, UK, June.

Chris Mattison / Grass snake (Natrix natrix helvetica) on white background. Yorkshire, England, UK, October.

Chris Mattison / Grass snake (Natrix natrix helvetica) on stones, Yorkshire, England, UK, October.

Daniel Heuclin / Grass snake (Natrix natrix) feigning death, Poitou, France, May.

Daniel Heuclin / Grass snake (Natrix natrix), Poitou, France, May.

Daniel Heuclin / Grass snake (Natrix natrix) feigning death, Poitou, France, May.

Daniel Heuclin / Grass snake (Natrix natrix) feigning death, Poitou, France, May.

Daniel Heuclin / Grass snake (Natrix natrix) eating toad (Bufo bufo), Poitou, France, June.

Daniel Heuclin / Grass snake (Natrix natrix) eating toad (Bufo bufo), Poitou, France, June.

Jussi Murtosaari / Grass snake (Natrix natrix) feeding on fish, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) feeding on fish, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) feeding on fish, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) feeding on fish, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) coming out of water, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) coming out of water, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) feeding on fish, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) on rock, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) swimming, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) feeding, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) swimming, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) swimming, Uto, Lounais-Finland / South-Western Finland, Finland, May.

Jussi Murtosaari / Grass snake (Natrix natrix) swimming, Uto, Lounais-Finland / South-Western Finland, Finland, May.