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Lesser Yellow Underwing Noctua comes Length 23-25mm. An attractive moth that rests with wings held flat, one forewing overlapping the other. Adult has variably buffish-brown to grey-brown forewings, usually with two dark spots and faint pale cross lines. Hindwings are yellow with a narrow, black subterminal band and dark crescent mark. Larva feeds on a range of herbaceous plants. Widespread and common.