On the wing this species is most likely to be confused with species of Pyrausta, although the black hindwing of the Small Yellow Underwing is traversed by a broad yellow band. Often rests with its hindwings exposed. Flies actively in sunshine visiting flowers such as dandelion and buttercup.
Size and Family
- Family – Clovers, Straws and allies (Heliothines)
- Small Sized
Conservation status
- UK BAP: Not listed
- Local (only found in some areas)
Caterpillar Food Plants
Seed capsules of Common Mouse-ear and Field Mouse-ear.
Habitat
Flower-rich grassland, including meadows, downland, sea-cliffs, roadside verges and grassy embankments.
Distribution
- Countries – England, Wales, Scotland, Ireland
- Thinly distributed but found widely over much of England, Wales, south-east Scotland and south-west Ireland. Easily overlooked because of its small size.

Small Yellow Underwing - Ilia Ustyantsev
Small Yellow Underwing
Ilia Ustyantsev

Small Yellow Underwing - Ilia Ustyantsev
Small Yellow Underwing
Ilia Ustyantsev

Small Yellow Underwing - Ryszard Szczygieł
Small Yellow Underwing
Ryszard Szczygieł

Small Yellow Underwing - Garry Barlow
Small Yellow Underwing
Garry Barlow

Small Yellow Underwing - Lez Round
Small Yellow Underwing
Lez Round