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 / 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...

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.

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.

Lorraine Bennery / Purple emperor butterfly (Apatura iris) male puddling, Haute-Marne, France, June.

MYN / Dirk Funhoff / Purple emperor butterfly (Apatura iris) pupa, Mannheim, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Purple emperor butterfly (Apatura iris) pupa, Mannheim, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Purple emperor butterfly (Apatura iris) adult showing underwing, Mannheim, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Purple emperor butterfly (Apatura iris) adult, Mannheim, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Lesser purple emperor butterfly (Apatura ilia), Mannheim, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Lesser purple emperor butterfly (Apatura ilia), Mannheim, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Lesser purple emperor butterfly (Apatura ilia), Mannheim, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Purple emperor butterfly (Apatura iris) caterpillar with silk, Lorsch, Hessen, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Lesser purple emperor butterfly (Apatura ilia), Lorsch, Hessen, Germany. May. Meetyourneighbours.net project

MYN / Dirk Funhoff / Lesser purple emperor butterfly (Apatura ilia) caterpillar, Lorsch, Hessen, Germany. May. Meetyourneighbours.net project

MYN / Dirk Funhoff / Lesser purple emperor butterfly (Apatura ilia), Lorsch, Hessen, Germany. July. Meetyourneighbours.net project

MYN / Dirk Funhoff / Lesser purple emperor butterfly (Apatura ilia) pupa on leaf, Lorsch, Hessen, Germany. Meetyourneighbours.net project

MYN / Dirk Funhoff / Lesser purple emperor butterfly (Apatura ilia) pupa, Lorsch, Hessen, Germany. Meetyourneighbours.net project

MYN / Dirk Funhoff / Purple emperor butterfly (Apatura iris) caterpillar, Lorsch, Hessen, Germany. May. Meetyourneighbours.net project

MYN / Dirk Funhoff / Lesser purple emperor butterfly (Apatura ilia), Lorsch, Hessen, Germany. June. Meetyourneighbours.net project

Jussi Murtosaari / Lesser purple emperor butterfly (Apatura ilia), female, South Karelia, Finland, August.

Jussi Murtosaari / Lesser purple emperor butterfly (Apatura ilia) male on the ground, South Karelia, Finland, August.

Jussi Murtosaari / Lesser purple emperor butterfly (Apatura ilia), male sitting on a stone with a fly, South Karelia, Finland, August.

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

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

Jussi Murtosaari / Lesser purple emperor butterfly (Apatura ilia) female on a leaf of aspen, Finland. July

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

John Abbott / Tawny Emperor Butterfly (Asterocampa clyton) Martin Dies Jr State Park, Jasper County, Texas, USA.

Jussi Murtosaari / Purple Emperor butterfly (Apatura iris) female on ground, South Karelia, southern Finland, July.

Jussi Murtosaari / Lesser Purple Emperor butterfly (Apatura ilia) male in oak tree, Finland, July.

Jussi Murtosaari / Purple Emperor butterfly (Apatura iris) male puddling on ground, South Karelia, southern Finland, July.

Jussi Murtosaari / Lesser Purple Emperor butterfly (Apatura ilia) female on grass flowers, southern Finland, August.

Jussi Murtosaari / Purple Emperor butterfly (Apatura iris) male puddling, South Karelia, southern Finland, July.

Jussi Murtosaari / Lesser Purple Emperor butterfly (Apatura ilia) male in oak tree, Finland, July.

Jussi Murtosaari / Lesser purple emperor (Apatura ilia) male, resting on a rock, Finland. July.

Jussi Murtosaari / Lesser purple emperor (Apatura ilia) female, resting on a rock, Finland. July.

Jussi Murtosaari / Lesser purple emperor (Apatura ilia) female, resting on a rock, Finland. July.

Jussi Murtosaari / Lesser purple emperor butterfly (Apatura ilia) male, in flight, Finland. July.