Alan Williams / Grayling Butterflies (Hipparchia semele) feeding on Sea Holly (Eryngium maritimum) growing on shore of Dee Estuary, Hoylake, Wirral, UK, August.

Alan Williams / Grayling Butterflies (Hipparchia semele) feeding on Sea Holly (Eryngium maritimum) growing on shore of Dee Estuary, Hoylake, Wirral, UK, July.

Colin Varndell / Grayling butterfly (Hipparchia semele) at rest on bell heather. Morden Bog, Dorset, UK August.

David Kjaer / Grayling butterfly (Hipparchia semele), Dorset, UK, July.

Colin Varndell / Grayling butterfly (Hipparchia semele) feeding on wild marjoram nectar. Dorset, UK, July.

Robin Chittenden / Grayling butterfly (Hipparchia semele) Suffolk, England, UK, August.

Jussi Murtosaari / Grayling butterfly (Hipparchia semele) Aland Islands, Finland, August.

Robin Chittenden / Grayling butterfly (Hipparchia semele) resting on Sea holly (Eryngium maritimum), Winterton, Norfolk, UK. August.

Robin Chittenden / Grayling butterfly (Hipparchia semele) nectaring on Sea holly (Eryngium maritimum), Winterton, Norfolk, UK. August.

Robin Chittenden / Grayling butterfly (Hipparchia semele) nectaring on Sea holly (Eryngium maritimum), Winterton, Norfolk, UK. August.

Nick Upton / Grayling butterfly (Hipparchia semele) nectaring on Cross-leaved heath (Erica tetralix) flowers, Dorset heathland, UK, July.

Nick Upton / Grayling butterfly (Hipparchia semele) resting on a Gorse bush, Dorset heathland, UK, July.