Hepialus humuli is one of the largest micro moths in Europe.
On continental Europe and mainland Britain the sexes of Hepialus humuli are very different:
The subspecies Hepialus humuli thulensis occurs on the Shetlands and Faroe Islands in the North Atlantic.
The reasons for the extraordinary variation seen for Hepialus humuli thulensis males are not fully understood. But it seems likely that at least 3 different evolutionary processes are involved. Find out more.