Silver-studded blue  (Plebeius argus)

Males are deep blue with a dark border and white fringe, and can be distinguished from other blue butterflies by the presence of a spur on the front legs (1). Females are brown, but both sexes possess metallic silver spots on the hindwings (3). The caterpillar grows to 1.3 centimetres in length, and is green in colour with a dark stripe along the back, and white stripes along the sides (2).