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.