One of the last of our butterflies to appear (along with the next two species, the Scotch argus and the brown hairstreak) this is a warmth-loving species of chalk downlands where the vegetation is short and the ground consequently warm. Once considered a great rarity, climate change and conservation work have pushed its population up.
Larval food plant: the grass sheep's fescue, where it grows as small tufts in short or broken turf.
Where seen: the chalk downlands of southern England, from Surrey to Wiltshire. Current conservation status: steadily improving, with an increase of 1202 per cent since 1979