December moth

A December moth standing on a a yellow leaf. It's a fluffy moth with wavy cream lines across its charcoal wings

December moth © Vaughn Matthews

December moth

Enw gwyddonol: Poecilocampa populi
This fluffy moth is one of the few species that fly in winter.

Species information

Ystadegau

Forewing length: 15-22mm

Statws cadwraethol

Common

Pryd i'w gweld

Adult: October to December
Caterpillar: April to June

Ynghylch

Unsurprisingly, December moths are one of the few species you’re likely to encounter in December, though adults first take to the wing in October. They are attracted to lights so will sometimes land on windows, or more often in dedicated moth traps. The females are much larger than the males. They lay eggs on a variety of deciduous trees, including oaks, birches and hawthorns. The eggs won’t hatch until spring, when the caterpillars emerge to feed on leaves. They feed at night, spending the day resting. December moths can be found in woodland, hedgerows, scrub, parks and sometimes gardens.

Sut i'w hadnabod

A dark moth with a very fluffy body. The wings are charcoal coloured, with two creamy white lines across them. The second line is strongly waved and often more obvious. The fluffy body is dark brown, with a creamy white head. Males are smaller than females and have feathery antennae.

The caterpillar is grey with black and pale mottling. It has sparse hairs across the back and underside, with a reddish band behind the head.

Dosbarthiad

Widespread and common across the UK

Roeddech chi yn gwybod?

Adult December moths don’t feed, they rely on the energy built up as a caterpillar.