Underwing
01
翼の下の羽, アンダーウィングの羽
the feathers on the underside of a bird's wing, which can have distinctive patterns and colors that are often visible in flight
02
夜蛾, 下翅
moth having dull forewings and brightly colored hind wings
翼の下の羽, アンダーウィングの羽
夜蛾, 下翅
