"The Adonis Blue (Polyommatus bellargus) is a butterfly in the family Lycaenidae…
It has been rapidly declining in the U.K. because its habitat (grasslands) has been
disappearing or becoming coarse and shady through a lack of grazing. There are
great efforts from conservation organisations and local Biodiversity Action Plans
to encourage the populations of chalk-grassland butterflies through managed
grazing programs. The recent hot and dry weather associated with climate change
seems to be beneficial for this species by making more habitats suitable."
(Wikipedia)