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Are dragonflies insects?

Dragonfly is an insect, which is the general name of Insecta, Odonata and Heteroptera. It is a carnivorous insect, feeding on flies, mosquitoes, butterflies and other agricultural and forestry pests, and is an important natural enemy insect beneficial to human beings. Dragonfly larvae live in water. The idiom "dragonflies touch water" is the biological feature of dragonflies laying eggs in water.