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...

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

Kim Taylor / Purple emperor butterfly (Apatura iris) male on birch showing coiled proboscis. Surrey, England, UK, June.

Adrian Davies / Blue Morpho butterfly (Morpho peleides showing iridescence with change of angle in relation to light source

MYN / Dirk Funhoff / Purple emperor butterfly (Apatura iris) showing irridescence on one wing due to angle of view, Mannheim, Germany. June.

Jussi Murtosaari / Purple emperor butterfly (Apatura iris), female on the ground, Finland

Jussi Murtosaari / Purple emperor butterfly (Apatura iris), male on a leaf, Finland, August.

Jussi Murtosaari / Lesser purple emperor butterfly (Apatura ilia), sitting on a leaf, Finland, August.

Jussi Murtosaari / Lesser purple emperor butterfly (Apatura ilia), male, Finland, August.