Dragonfly is mainly found in tropical and subtropical regions.

The hindwing base is slightly larger than the forewing base, and the veins are slightly different. At rest, the four wings spread out and lie flat on the sides.

There are 11 families in total, including Aeshnoidea, Cordulegastroidea, and Libelluloidea. Dragonflies are the most common and are widely distributed throughout the country.

Dragonflies are carnivorous insects. Dragonflies a kind of beneficial insect, it is very beneficial to people's lives, this is because they will mainly eat flies, mosquitoes, and other insects.

It can be very good to eliminate some pests, so it is a beneficial insect. It also eats small moths and insects that crawl or fly.

Dragonflies have the biological trait of laying their eggs in water.

It's the larva lives in water, the life period varies by species, the average is 2 years, some as long as 3 to 5 years.

Dragonflies can be used to monitor environmental pollution and have medicinal, edible, and ornamental values.

Dragonflies are a relatively primitive and diverse group of insects. There are about 5,000 species worldwide.

Dragonflies like wet conditions, so they usually fly in ponds or rivers, and their larvae also need to develop in water.

Dragonfly insects are half-metamorphosed in development, and only have eggs, nymphs, and adult 3 stages.

In addition to preying on other kinds of insects, dragonflies also have the habit of cannibalizing each other between species. They grab their prey as they hunt.

A large amount of thick hair on its feet helps it hold onto its prey, making it impossible for it to escape. The mouthparts are also well developed, capable of biting prey and eating easily, and can eat up their body weight in food within 30 minutes.

Dragonflies have the following characteristics:

1. Dragonflies have the most eyes of any insect in the world. The dragonfly's eyes are large and bulging, occupying the vast majority of its head.

There are three single eyes, and the compound eye is composed of more than 28,000 small eyes.

2. Compound eyes can measure speed. When the object moves in front of the complex, each "small eye" produces a reaction in turn, after processing can determine the speed of the target object.

3. Dragonflies have developed wings. The front and rear wings are long and narrow, and membranous, and the reticulated veins are very clear. The flying ability is very strong, up to 10 meters per second.

It can turn around suddenly, go straight into the sky, and sometimes fly backward.

4. The abdomen is slender. Although the structure of the adult is quite the same, the size is very different, the wingspan is generally 5 cm.