It is a relatively primitive group in the class of Insects, and it is also a smaller one. Odonata is divided into three suborders. The Hypoptera are collectively called "Dragonfly", the Homoptera are collectively called "Ecostera" and the two found in Japan and India, species of Methoptera insects. There are about 5,000 species in the world, and there are more than 300 species in China. The dragonfly has a stout body, with wings spread out on both sides of the body when resting, and a long and slender body. When resting, the wings are tied on the back. The order has a sturdy body and wings tied on the back. Odonata is an incomplete metamorphosis insect, the larva "Shuiji" live predatory life in the water. Adults are also carnivorous species, prey on small insects, fly fast, temperament Fierce.... Many of these species are familiar to us, the mayflies that "live and die"-mayfly, the ferocious mantis-praying mantis, the omnipresent cockroach-cockroaches, annoying milky eyes- Body lice. Insects are very adaptable, whether you like it or not, they all have a place in our lives...