Ynghylch

Heralds are one of the few moths that spend the winter as an adult. They take to the wing in late summer, then in autumn they seek out a cool, dark, sheltered spot. This could be a cave, a shed, an old barn, or any similar structure. They'll cling to a wall or ceiling all winter, before emerging to feed again in spring. Several heralds can often be found sheltering together, sometimes with other species of wintering moths and butterflies.

Herald moths fly at night and visit flowers to feed, including ivy flowers in autumn. They also feed on overripe berries and can be attracted to sugar solutions put out to lure in moths. They are sometimes attracted to lights.

Heralds are found in a wide variety of habitats, including parks and gardens — just about anywhere their foodplants are available. The caterpillars feed on willows and poplars. They pupate in a sparse silk cocoon spun between leaves.