蝶に似た姿をしているが、多くは夜に活動し蝶より体毛が発達している。翅の色は茶色や灰色系が多く、保護色の役割を果たす。灯火などの光に引き寄せられる姿がよく見られる。幼虫の時期には葉や農作物を食べて被害を与えたりもする。
Although similar in shape to butterflies, they are generally active at night and have a hairier body. Their wings are usually brown or gray, serving as camouflage. They are easily attracted to light and often gather around lamps. During the larval stage, they feed on leaves and farming crops, sometimes causing damage.