Dragonflies are carnivorous insects, which eat many pests and are beneficial insects. Dragonfly is a general term for invertebrates, Insecta, Odonata and Heteroptera. The base of the hind wing is slightly larger than the front wing, and the wing veins are slightly different. When resting, spread your wings and lay them flat on your sides. Dragonfly larvae live in water and can prey on dragonflies or other small animals, sometimes cannibalizing each other. Adults can not only prey on mosquitoes and flies, but also some pests such as butterflies, moths and bees.

Dragonflies not only prey on other insects, but also have the habit of adults eating each other among species. When they prey, they will catch their prey fiercely, and there are a lot of coarse hairs on their feet, which can help them catch their prey and make it impossible to escape. The mouth is also quite developed, it can bite prey, facilitate eating, and can eat up food equivalent to its own weight within 30 minutes.

Dragonflies are carnivorous insects. They prey on flies, mosquitoes, leafhoppers, grubs, small butterfly moths and other agricultural, forestry and animal husbandry pests. Dragonfly is an important natural enemy insect beneficial to human beings. "Dragonflies touch water" is the biological feature of dragonflies laying eggs in water. Its larvae (larvae) live in water, and their life span varies from species to species. Odonata usually lasts for 2 years, and some last for 3 to 5 years.

Dragonflies are mainly distributed in tropical and subtropical regions. Dragonflies like wet environment, usually fly in ponds or rivers, and their larvae also need to develop in water. Odonata insects are rich in resources and play an important role in many aspects. It can be used to monitor environmental pollution and has medicinal, edible and ornamental values.