People remember dragonflies as small and light, dancing in flowers, or falling on the water. As we all know, hundreds of millions of years ago, the small and lovely dragonfly was also a "giant" in the sky.

Dragonfly is an ancient insect, which can be traced back to 320 million years ago. The largest dragonfly, with a wingspan of 710 mm, is the largest insect known in the world.

Now dragonflies are mainly distributed in tropical and subtropical areas.

The shape of the dragonfly.

Dragonflies have the most eyes in the world. The eyes of the dragonfly are large and protruding, occupying most of the head, with three single eyes and about 28000 small eyes.

Dragonfly has well-developed wings, the front and back wings are the same length and narrow, and the membranous and reticular veins are very clear.

Dragonfly has a slanted chest, small forechest and can move. The abdomen of dragonfly is slender, flat or cylindrical, with anal appendages at the end. The feet were thin and weak, with hooks and thorns.

Interesting stories about dragonflies.

1. Some scientists put forward the theory that dragonflies could grow to the size of monsters in the oxygen rich Paleozoic.

2. There are more than 5000 known dragonflies, all belonging to the order Odonata, with serrated teeth.

3. The larval stage can be as long as two years. The small dragonfly is an aquatic animal that eats almost everything, such as tadpoles, mosquitoes, fish and other insect larvae, and even feeds on each other.

4. Dragonfly is a master pilot. They can fly up and down in a straight line and hover like helicopters. If they can't fly, they will starve because they only eat the prey caught in flight.

5. Dragonfly's flight is so special that it has inspired engineers' dreams of creating robots that can fly like dragonflies.

6. Some adult dragonflies can only live for a few weeks, while others can live for a year.

7. Hundreds of dragonflies of different species gather in groups, either foraging or migrating. At present, little is known about this behavior.

8. Dragonflies have very good eyesight. They can look up, down, forward and backward without turning their heads. Its compound eyes can also measure speed.

When an object moves in front of a complex eye, each eye reacts in turn, and can determine the speed of the object through processing.

The main value of dragonflies.

1. Bionics.

The bionic camera is a compound eye camera that imitates the unique structure principle of the dragonfly compound eye. It can take thousands of photos at a time.

Dragonfly has cutin thickened wing moles on the front edge of its wings, which can eliminate the wing tremor during flight. The aircraft designer added a counterweight to each wing of the aircraft to prevent the wing from breaking due to severe vibration.

2. Appreciation value.

Many dragonflies are colorful and are a large category of ornamental insects.

Dragonfly, as a common insect, can be found in most water areas.