view of a White-letter Hairstreak resting on a leaf showing the undersides of its wings and the diagnostic markings

White-letter Hairstreak. Photo: Mark Pike

Mark found this White-letter Hairstreak at Alners Gorse, its Dorset stronghold, on 19/07/18.

The White-letter Hairstreak is one of our more-elusive butterflies as it flits high in the treetops, often appearing as a dark speck against the sky. It gets its name from the letter “W” that is formed from a series of white lines found on the underside of the hindwings.

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