This species is exceptionally variable throughout its range and varies from relatively plain dark to buff and orange individuals.
In the darker forms especially, there is usually a distinctive paler fringe to the forewing.
It flies early in the year, from March to May, and it occupies a range of habitats.
It is common in most of Europe.
The larvae feed on a number of trees and shrubs, but especially oak.

Caught in my self made moth trap.
First 3 photos: In my yard, Hilversum, The Netherlands, 31 March 2019
Last 2 photos:  In my yard, Hilversum, The Netherlands, 10 May 2020