What’s this? A fritillary? No — look at those eye spots, it’s a wall butterfly (Lasiommata megera).
They live in short grassland especially where the sward is broken by rocks, furrows and walls (they like Wales), they are seen on grassy railway embankments and green verges, usually alone. Perhaps you’ll see a male flitting along looking for a female or resting with its wings folded together, showing the mottled grey underside, camouflaged on a rocky outcrop. This one was enjoying the May sunshine with its wings outstretched on the edge of a country lane that has a wide verge (the long acre) waiting to flutter up to waylay a passing female.
Their numbers are dwindling and they represent a high conservation priority as, although widespread in coastal England and Wales, they are rapidly declining. Rare now in central England it was presumed due to loss of habitat because of building and changes in farming, less grazing and the use of insecticides to protect arable crops. But there may be another reason: there is evidence that warmer temperatures are causing generations to hatch out too late in the year to survive.
About three years ago everyone here was complaining bitterly about the council not cutting the verges regularly anymore. This year the verges are blue with a resplendent crop of wild hyacinths, self sown or grown from dormant bluebell bulbs which lay waiting for a reprieve from incessant mowing. It’s an austerity bonus! Good for bees!
As our lonely wall butterfly flits off to find a mate it reminds us of the enormous value of our 937 square miles of verges in the UK — twice the size of Exmoor and the New Forest put together — let’s mow them all just once a year and stop spraying and, while we’re at it, please can we turn off all the street lamps!