Ingo Arndt / Ismenius longwing butterfly (Heliconius ismenius), South America (Captive)

Ingo Arndt / Egg of Heliconius butterfly (Heliconius sp) attached to tendril of Passion plant, South America

Nick Hawkins / Tiger longwing butterfly (Heliconius hecale) photographed on white background, Costa Rica.

Nick Hawkins / Small postman butterfly (Heliconius erato) photographed on white background, Costa Rica.

Doug Wechsler / Sara longwing (Heliconius sara) Province El Oro, Buenaventura Biological Reserve, Ecuador

SCOTLAND: The Big Picture / Mosaic of agricultural land, forestry and moorland at sunrise, Aberdeenshire, Scotland, UK, December 2015.

Pete Oxford / Heliconius Butterfly (Heliconius sp), Mindo Cloud Forest, Ecuador

Pete Oxford / Heliconius Butterfly (Heliconius sp), Mindo Cloud Forest, Ecuador

Pete Oxford / Heliconius Butterfly (Heliconius sp), Mindo Cloud Forest, Ecuador

Pete Oxford / False Zebra Longwing (Heliconius atthis) butterfly, Mindo Cloud Forest, Ecuador

Loic Poidevin / Red postman butterfly (Heliconus erato) on leaf, captive, occurs in the Americas.

Loic Poidevin / Cydno longwing (Heliconus cydno) captive, occurs in the Americas.