Noctua (Latin for "little owl") is a genus of moths. They have dull, cryptic forewings and often very bright hind wings. These are hidden under the forewings when the moths rest, leading to their common name of yellow underwings. They are not particularly closely related to the "true" underwing moths (Catocala) though, apart from both being Noctuoidea (and in the traditional classification, Noctuidae). They are good fliers.