David Tipling / Common European adder (Vipera berus) two males fighting over a female. Holt, North Norfolk, England, UK. April

David Tipling / Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April

David Tipling / Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April.

Michael Hutchinson / Slow motion clip of a Common carder bumblebee (Bombus pascuorum) feeding from a Viper's bugloss (Echium vulgare) flower, Bristol, England, UK, September.

Pete Oxford / Fer-de-lance (Bothrops asper), native to South America

Alex Hyde / Common Swallowtail Butterfly (Papilio machaon) resting on Viper's Bugloss / Blueweed (Echium vulgare) in alpine meadow. Nordtirol, Tirol, Austrian Alps, Austria, 1700 metres altitude, July.

Alex Hyde / Common Swallowtail Butterfly (Papilio machaon) resting on Viper's Bugloss / Blueweed (Echium vulgare) in alpine meadow. Nordtirol, Tirol, Austrian Alps, Austria, 1700 metres altitude, July.

Morley Read / Slow motion clip of a Fer de Lance (Bothrops atrox) smelling with its tongue, Orellana Province, Ecuador. (non-ex)

Morley Read / Fer de Lance (Bothrops atrox) on the rainforest floor, Orellana Province, Ecuador. (non-ex)

Nick Garbutt / Apollo butterfly (Parnassius apollo) nectaring on Viper's bugloss (Echium vulgare) flower. North Tyrol, Austria. June. Focus stacked image.

David Tipling / Common European adder (Vipera berus) male warming up in sun trap on heath, Holt, North Norfolk, England, UK. April.

David Tipling / Common European adder (Vipera berus) male guarding female before mating on heath, Holt, North Norfolk, England, UK. April.

David Tipling / Common European adder (Vipera berus) male guarding female before mating on heath Holt, North Norfolk, England, UK. April.

David Tipling / Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April.

David Tipling / Common European adder (Vipera berus) two males fighting over a female, Holt, North Norfolk, England, UK. April.

David Tipling / Common European adder (Vipera berus) male and female warming up in sun trap on heath, Holt, North Norfolk, England, UK. March.

David Tipling / Common European adder (Vipera berus) male and female warming up in sun trap on heath, Holt, North Norfolk, England, UK. March.

Fabio Pupin / Common adder, (Vipera berus), montane habitat, Alps, Italy, May . Non-ex.

Fabio Pupin / Common adder, (Vipera berus), dark moprh, Alps, Italy, October . Non-ex.

Fabio Pupin / Common adder, (Vipera berus), dark moprh, Alps, Italy, October . Non-ex.

Heather Angel / Marmalade hoverfly (Episyrphus balteatus) feeding on pollen on Viper's bugloss (Echium vulgare) anther. Dolomites, Italy. June.

David Woodfall / Corn Marigold (Chrysanthemum segetum) and Bugloss (Echium vulgare) in strips on machair. North Uist, Outer Hebrides, Scotland, UK, July.

Ernie Janes / Vipers bugloss (Echium vulgare) in flower with Ragwort (Senecio jacobaea) Scotland, UK. July.

Bruno D'Amicis / Melanistic Asp viper (Vipera aspis) moving between the roots of ancient tree in old growth Beech (Fagus sylvatica) forest. Abruzzo, Lazio and Molise National Park / Parco Nazionale d'Abruzzo, Lazi...

Alain Dragesco-Joffe / Sand cat (Felis margarita) eating a Common viper (Cerastes vipera) Tenere, Sahara, Niger

Alain Dragesco-Joffe / Sand cat (Felis margarita) eating a Common viper (Cerastes vipera) Tenere, Sahara, Niger

Alain Dragesco-Joffe / Sand cat (Felis margarita) attacking a Common viper (Cerastes vipera) Tenere, Sahara, Niger

Alain Dragesco-Joffe / Sand cat (Felis margarita) evading bite from Common viper (Cerastes vipera) prey, Tenere, Sahara, Niger

Daniel Heuclin / Fer-de-lance (Bothrops lanceolatus) on white background, captive, endemic to Martinique.

Daniel Heuclin / Fer-de-lance (Bothrops lanceolatus) captive, endemic to Martinique.

Daniel Heuclin / Fer-de-lance (Bothrops lanceolatus) captive, endemic to Martinique.

Daniel Heuclin / Fer-de-lance (Bothrops lanceolatus) captive, endemic to Martinique.

Daniel Heuclin / Fer-de-lance (Bothrops lanceolatus) captive, endemic to Martinique.

Daniel Heuclin / Fer-de-lance (Bothrops lanceolatus) captive, endemic to Martinique.

Daniel Heuclin / Fer-de-lance (Bothrops lanceolatus) captive, endemic to Martinique.

Chien Lee / Mock Viper (Psammodynastes pulverulentus), Tawau Hills Park, Sabah, Malaysia

Kim Taylor / Viper's Bugloss (Echium vulgare). Apennines, Italy, May.

Lucas Bustamante / Common lancehead (Bothrops atrox) curled up, Yasuni National Park, Orellana, Ecuador.

Michael Hutchinson / Slow motion clip of a Common carder bumblebee (Bombus pascuorum) feeding from a Viper's bugloss (Echium vulgare) flower, Bristol, England, UK, September.

David Kjaer / Viper's Bugloss (Echium vulgare) in flower along edge of track, Wiltshire, England, UK, June.

David Kjaer / Viper's bugloss (Echium vulgare) in flower, Wiltshire, England, UK, June.

David Kjaer / Viper's bugloss (Echium vulgare) in flower, Wiltshire, England, UK, June.

Sue Daly / Viper's-bugloss (Echium vulgare), Herm, British Channel Islands, June.

Sue Daly / Viper's-bugloss (Echium vulgare), Herm, British Channel Islands, June.

Terry Whittaker / Pair of Marbled white butterflies (Melanargia galathea) on Viper's bugloss (Echium vulgare), Kent, England, UK, July.

Terry Whittaker / Pair of Marbled white butterflies (Melanargia galathea) mating on Viper's bugloss (Echium vulgare), Kent, England, UK. July.

Terry Whittaker / Pair of Marbled white butterflies (Melanargia galathea) mating on Viper's bugloss (Echium vulgare), Kent, England, UK, July.

Paul Harcourt Davies / Viper's bugloss (Echium vulgare) growing with Stachys sp, Melampyrum and others near Campo Imperatore, Abruzzo, Italy June.

Paul Harcourt Davies / Viper's bugloss (Echium vulgare) growing with Stachys sp, Melampyrum and others near Campo Imperatore, Abruzzo, Italy June 2016

Nick Upton / Brimstone butterfly (Gonepteryx rhamni) nectaring on a Viper's bugloss flower (Echium vulgare), Cares Gorge, Picos de Europa mountains, Spain, August.

Terry Whittaker / Mating marbled white butterflies (Melanargia galathea) on viper's bugloss (Echium vulgare). Kent, UK. July

Terry Whittaker / Marbled white butterflies (Melanargia galathea) mating on viper's bugloss (Echium vulgare). Kent, UK. July

Terry Whittaker / Mating marbled white butterflies (Melanargia galathea) on viper's bugloss (Echium vulgare). Kent, UK. July

Terry Whittaker / Mating marbled white butterflies (Melanargia galathea) on viper's bugloss (Echium vulgare). Kent, UK. July

Terry Whittaker / Mating marbled white butterflies (Melanargia galathea) on viper's bugloss (Echium vulgare). Kent, UK. July

Terry Whittaker / Small white butterfly (Pieris rapae) on viper's bugloss (Echium vulgare). Kent, UK. July

Terry Whittaker / Small white butterfly (Pieris rapae) on viper's bugloss (Echium vulgare). Kent, UK. July

Terry Whittaker / Small white butterfly (Pieris rapae) on viper's bugloss (Echium vulgare). Kent, UK. July

Lorraine Bennery / Crab spider (Misumena vatia) and its prey (Leptidea sp.) on Viper's bugloss flower (Echium vulgare), Fontainebleau forest, France, July.

Lorraine Bennery / Crab spider (Misumena vatia) on Viper's bugloss flower (Echium vulgare), Fontainebleau forest, France, July.

Colin Varndell / Viper's bugloss (Echium vulgare) in flower in Kingbarrow Quarry, Portland, Dorset, UK. July

Andres M. Dominguez / Juvenile Common stonechat (Saxicola torquata) in a Viper's bugloss (Echium vulgare) flowering. Sierra de Grazalema Natural Park, southern Spain, May.

John Cancalosi / Timber rattlesnakes (Crotalus horridus) gravid females basking to bring young to term with Common garter snakes (Thamnophis sirtalis) Pennsylvania, USA

Nick Upton / Viper's bugloss clump (Echium vulgare) flowering on Piva plateau among limestone scree, near Trsa, Montenegro, July.

Alex Hyde / Viper's Bugloss / Blueweed (Echium vulgare) Nordtirol, Austrian Alps, 1700 metres altitude, July.

Gary K. Smith / Wasteland on industrial estate with wildflowers including Ragwort (Senecio jacobaea), Teasel (Dipsacus fullonum) and Viper's bugloss (Echium vulgare) Norfolk, England UK. July

Dave Bevan / Large skipper (Ochlodes venatus) feeding on nectar from Vipers bugloss (Echium vulgare) Hungary, June.

Dave Bevan / Eastern bath white (Pontia daplidice) male feeding on Vipers bugloss (Echium vulgare) Hungary, June.

Dave Bevan / Wartbiter cricket (Decticus verructivorus) male at rest on Vipers bugloss (Echium vulgare) Hungary, June.

Pete Oxford / Fer-de-lance (Bothrops asper), native to South America

Pete Oxford / Common Lancehead (Bothrops atrox), native to South America

Pete Oxford / Common Lancehead (Bothrops atrox), native to South America

Pete Oxford / Common Lancehead (Bothrops atrox), native to South America

Pete Oxford / Common Lancehead (Bothrops atrox), native to South America

Chris Mattison / Viper's bugloss (Echium vulgare) Oxwich Nature Reserve, Gower, South Wales, UK, June.

Konrad Wothe / Common lancehead (Bothrops atrox) at night, Panguana Reserve, Huanuca province, Amazon basin, Peru.

Ann & Steve Toon / Viper's bugloss (Echium vulgare) being grown for seed by Landlife, Inglenook Farm, Rainford, Merseyside, UK, June.

Pete Oxford / Fer-de-Lance (Bothrops atrox) juvenile, Amazon, Ecuador. Captive, occurs in Central and South America.

Pete Oxford / Fer-de-Lance (Bothrops atrox) juvenile, Amazon, Ecuador. Captive, occurs in Central and South America.

Pete Oxford / Fer-de-Lance (Bothrops atrox) Amazon, Ecuador. Captive, occurs in Central and South America.

Ernie Janes / Bees feeding on Vipers bugloss (Echium vulgare). Norfolk, UK, June.

Pete Oxford / Fer-de-lance (Bothrops asper), native to South America

Luiz Claudio Marigo / Fer-de-lance or Common Lancehead (Bothrops atrox), a poisonous snake in Varzea flooded rainforest of Mamiraua Sustainable Development Reserve, Alvaraes, Amazon, Amazonas State, Northern Brazil.

David Woodfall / Pots of Vipers bugloss (Echium vulgare) and Chives (Allium schoenoprasum) on urban roof tops to encourage resident honey bees, Manchester Art gallery, England, UK, June 2014.

David Woodfall / Bumblebee (Bombus sp) on Vipers bugloss (Echium vulgare) grown on roof top of Manchester Art Gallery to attract pollinating insects, Manchester, England, UK. June 2014.

David Woodfall / Pots of Vipers bugloss (Echium vulgare) and Chives (Allium schoenoprasum) on urban roof tops to encourage resident honey bees, Manchester Art gallery, England, UK, June 2014.

David Woodfall / Bumblebee (Bombus sp) on Vipers bugloss (Echium vulgare) grown on roof top of Manchester Art Gallery to attract pollinating insects, Manchester, England, UK. June 2014.

David Woodfall / Bumblebee (Bombus sp) on Vipers bugloss (Echium vulgare) grown on roof top of Manchester Art Gallery to attract pollinating insects, Manchester, England, UK. June 2014.

John Cancalosi / Timber Rattlesnakes (Crotalus horridus) gravid females basking with gravid Common garter snake (Thamnophis sirtalis) Pennsylvania, USA, July.

John Cancalosi / Timber rattlesnakes (Crotalus horridus) gravid females basking to bring young to term, Common gartersnake, (Thamnophis sirtalis) also visible in the group, Pennsylvania, USA, July.

John Cancalosi / Timber rattlesnakes (Crotalus horridus) and Common gartersnake (Thamnophis sirtalis) gravid females, Pennsylvania, USA, July.

John Cancalosi / Timber Rattlesnakes (Crotalus horridus) gravid females basking with Common garter snake (Thanophis sirtalis) Pennsylvania, USA, July.

John Cancalosi / Timber rattlesnakes (Crotalus horridus) gravid females basking with Common gartersnake (Thamnophis sirtalis) also visible in the group. Pennsylvania, USA, July.

Daniel Heuclin / Lance-headed viper (Bothrops atrox) French Guiana

Daniel Heuclin / Lance-headed viper (Bothrops atrox) French Guiana

Fabrice Cahez / Vipers bugloss (Echium vulgare) Causse Mejean, Lozere, France, July.