The Brimstone Butterfly is often credited with inspiring the English word "butterfly" due to the male's bright yellow, butter-colored wings. Remarkably, it boasts one of the longest lifespans among UK butterflies, living up to a year and hibernating through the winter as an adult.

Brimstones are widespread across much of England and Wales, frequenting woodlands, hedgerows, gardens, and meadows. They are among the earliest butterflies to emerge in spring, often seen on warm days as early as February.

Adult Brimstones feed on nectar from a variety of flowers, including primroses, bluebells, and thistles. Their caterpillars, however, are dependent on buckthorn and alder buckthorn plants, which influences the butterfly's distribution.