Alex Hyde / Purple emperor butterfly (Apatura iris) male on English Oak (Quercus robur) leaf basking with wings open, UK, Captive.

Hans Christoph Kappel / Lesser Purple Emperor butterfly caterpillar

Hans Christoph Kappel / Lesser Purple Emperor butterfly.

David Woodfall / Purple emperor butterfly (Apatura iris) male basking on ground. Knepp Rewildling Estate, Sussex, England, UK.

David Woodfall / Purple emperor butterfly (Apatura iris) male on field maple hedge. Knepp Rewildling Estate, Sussex, England, UK.

David Woodfall / Purple emperor butterfly (Apatura iris) female with closed wings. Knepp Rewildling Estate, West Sussex, England, UK.

David Woodfall / Tamworth pig with mud on its snout from rooting around in soil which helps to create a habitat for Purple emperor butterflies (Apatura iris), Knepp, West Sussex, UK. June. Small repro only.

David Woodfall / Purple emperor butterfly (Apatura iris) male puddling. Knepp Wildland Project, formerly intensive farmland now turned to conservation and sustainable farming. Horsham, West Sussex. England, UK. June

David Woodfall / Purple emperor butterfly (Apatura iris) female on rose bush. Knepp Wildland Project, formerly intensive farmland now turned to conservation and sustainable farming. Horsham, West Sussex. England, UK....

David Woodfall / Purple emperor butterfly (Apatura iris) female on rose bush. Knepp Wildland Project, formerly intensive farmland now turned to conservation and sustainable farming. Horsham, West Sussex. England, UK....

David Woodfall / Purple emperor butterfly (Apatura iris) male puddling. Knepp Wildland Project, formerly intensive farmland now turned to conservation and sustainable farming. Horsham, West Sussex. England, UK. June

David Woodfall / Purple emperor butterfly (Apatura iris) male on Goat willow (Salix caprea). Knepp Wildland Project, formerly intensive farmland now turned to conservation and sustainable farming. Horsham, West Sussex...