The common blue is widespread in Ireland, found mainly in dry, open habitats with the largest populations on sand dunes and extensive unimproved grassland. It is considered to have a status of least concern, but recently there has been an estimated 96% population loss for the common blue due to habitat loss.

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Males have blue wings with a black-brown border and white fringe. Females are usually brown with a blue dusting and a few orange spots on the lower parts of the wings.

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