Common Brimstone, Gonepteryx rhamni

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Common Brimstone, Gonepteryx rhamni, male on Bull Thistle (Cirsium vulgare) , Oberaegeri, Switzerland, March 1994
Common Brimstone, Gonepteryx rhamni, male on Bull Thistle (Cirsium vulgare) , Oberaegeri, Switzerland, March 1994