In April and May there are not a lot of moths about but the most common by far is the Hebrew character (Orthosia gothica). It is not hard to see why it bears that name; that distinctive mark on the wings is quite diagnostic and recalls a form of hieroglyphics! .
The Hebrew character is a resident moth species as opposed to migratory. It overwinters as a pupa and hatches into an adult in early spring. It can be flying as early as March and then on in to May. It is single brooded and the larvae hatch and are active on a wide variety of trees during May and June before pupating. The adult moth is particularly fond of sallow blossom.