Fortunately clearwings leave distinctive field signs that are relatively easy to spot.
Adult Welsh Clearwings emerge from cocoons on sunny mornings in June and July, leaving round "exit holes", roughly 5mm in diameter, in the trunks of tenanted trees.
Outside Wales, Welsh Clearwings have a similarly patchy distribution, with just two known English populations at Cannock Chase and Sherwood forest, and a few scattered populations in Scotland.
Yet the exact characteristics of birch trees favoured by Welsh Clearwing remains a stubborn mystery.
Given the extent of birch woodland in Wales, it seems highly plausible there are populations of Welsh Clearwing that have yet to be discovered.
If you have seen, a clearwing moth of any species, or evidence of tree occupation, please contact us at SERT on firstname.lastname@example.org.
THE Welsh Clearwing is a rare and elusive day-flying moth, the larvae of which feed on the bark of downy and silver birch.
There are few species with a history more inextricably linked to Wales than the Welsh Clearwing, so it is unfortunate that it has not achieved the flagship status associated with other iconic species in Wales such as the red kite.
How many people are even aware of the existence of the Welsh Clearwing? Like almost all members of the 15-strong clearwing family, the moth is an excellent mimic, resembling a member of the wasp family in both appearance and flight movement.
Mothing was disappointing earlier this week at Dempsey Towers, with just a few shuttle-shaped darts, clearwings
and a brimstone moth for company, but our resident hedgehogs are busy foraging most evenings.