Brimstone Gonepteryx rhamni
The Brimstone is widely distributed and is usually found in scrubby woodland and hedgerows. It is highly nomadic, often seen far from its breeding grounds and in urban habitats.
The male Brimstone is sulphur yellow and the female is pale lemon or greenish-yellow, which can cause it to be confused with the Large White at a distance, but the Brimstone has no black on its wings.
It is a long-lived, single-brooded butterfly which first appears after hibernation in March or earlier. It continues to fly until late June/early July, with the second generation appearing in late July, until it enters hibernation during the autumn/winter.
Larval food plants are Buckthorn and Alder Buckthorn. Thistles, buddleia and knapweed are favourite nectar sources in summer.