Contrary to its venacular name, this species does not feed on oak. It is so named because of the shape of its cocoon.
Males fly during the day, females fly from dusk and come to light with the first few hours of darkness.
Pupates in a brown cocoon in leaf litter.
Heathland, woodland, grassland, hedgerows, scrub and fen.
Recorded in 3 (0.2%) of the 1900 10km squares of Bulgaria.
Last recorded in July 2013
Recorded date range (Adult): 01 July to 20 July