The Holly Blue, Celastrina argiolus is a light blue butterfly which often flies at head height.
It also differs from other blue butterflies in being a butterfly of shrubs rather than of grassland and can be seen in hedgerows, field margins, woodland rides, gardens, and parks, including those in urban and suburban areas. It often breeds in churchyards, many of which have Holly and Ivy, its main food plants.
The larvae feed predominantly on the flower buds, berries, and terminal leaves of Holly in the spring generation, and Ivy in the summer generation.
Visiting any of our nature reserves at this time of year may allow views of this butterfly.