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The Brimstone Butterfly (Gonepteryx rhamni) is of the family Pieridae which is in genus Gonepteryx. It occurs in Europe, Asia and parts of northern Africa. The presence of its larval host plants, Alder Buckthorn (Rhamnus frangula) and Common Buckthorn (Rhamnus carthartica) influences its geographic range and distribution. This butterfly can
live for up to a year and the flight season is from April to August. It
then goes into hibernation and emerges in early spring the following year.
Patrick J. O'Keeffe / Raw Birds