蝉,也叫知了,是同翅目蝉科的常见昆虫。雄蝉的腹部有发音器,能连续不断地发出美妙的声音;雌蝉不会发声,但腹部有听器。在夏季,雄蝉每天都唱个不停,引诱雌蝉前来交配。蝉是不完全变态的昆虫,由卵发育到幼虫(若虫)后,不经过蛹的时期而变为成虫。蝉的幼虫生活在土里,数年后才能来到地面上成为成虫。幼虫和成虫均以植物汁液为食。 Cicada, also known as, is a common insect of the Homoptera. The male cicada’s belly has a sound generator that emits a wonderful sound continuously; the female cicada does not sound, but the abdomen has a hearing aid. In the summer, male cicadas sing every day, seduce female cicadas to mating. Cicadas are insects that are not completely metamorphic and change from adults to larvae (nymphs) after they develop into pupae. Cicada larvae live in the soil, and only after a few years can they come to the ground to become adults. Larvae and adults feed on plant juices.