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Brimstone - Gonepteryx rhamni - female. Wingspan 60mm. A colourful butterfly and a harbinger of spring. Adult has distinctive wings: rounded overall with pointed tips; those on the forewings are hooked. Male is brimstone-yellow; female is much paler and could be mistaken for a Large White in flight. Single-brooded: adults hatch in August, then hibernate and emerge on sunny spring days. Larva is green with pale lateral line; feeds on Buckthorn and Alder Buckthorn. Locally common in England and Wales.