
Pictured: wall brown, Lasiommata megera
Notes from Jenyns: Common everywhere.
200-year trend in Cambridgeshire: Decline.
Modern records
This once common species is now nationally a cause for concern, with declines being most dramatic in southern England. Far fewer can be seen today than in Jenyns’ time, especially in Cambridgeshire, and a national research project is trying to better understand the reasons for its downward trend. Climate change appears to be a key factor, as the species is still thriving and expanding its range in the north of Britain.
National records map
Wall brown national records map: https://species.nbnatlas.org/species/NHMSYS0000503020