What is the value of dragonflies? What is the function of its tail?

Dragonflies, also known as Ding Ding, lighting the lantern, the ant, the bear, the multiplication, the gauze sheep, the mountain mi, the light listens, is a kind of common insect in the countryside, is also a kind of beneficial insect, likes to roam in the wet place, has the very strong flight ability, is good at preying on some pests. Let's take a look at the value of dragonflies. What is the function of its tail?

What is the value of dragonflies?

1. Medicinal value

Dragonfly is a common folk animal medicine, which has the effects of tonifying kidney, strengthening yin, relieving cough and so on. There are all these related records in ancient books. The common medicinal species of dragonflies are red, yellow, blue, summer, brown-shouldered gray and giant round buttocks.

2. Edible value

The larvae and pupae of some species of dragonflies have high nutritional value and can be used for human consumption. This kind of edible dragonflies can only be found in specific areas or restaurants. Although the red dragonfly has a very high protein content, many people dare not have common sense easily. The common edible dragonflies in China are red dragonfly, pontoon, horned arrow fly, Biwei fly, white-tailed gray mackerel, black different-color gray mackerel, yellow mackerel and rhubarb red mole.

3. Bionics

The bionic camera is a familiar photo plane, which can take thousands of repeated photos at one time, which is based on the compound eye structure of the dragonfly. The dragonfly's eyes are round and occupy a large part of the head, which is very large, but it still looks very coordinated. Each eye of a dragonfly is made up of countless "small eyes". These "small eyes" are connected with photosensitive cells and nerves, and can clearly distinguish the size and shape of objects. The dragonfly's eyes are still very flexible, and it can look up, down, forward and backward without turning its head.

4. Other values

Dragonfly can be used as an indicator of heavy metal pollution in water, because its larvae have a certain concentration of cadmium and mercury, and the content of heavy metals in the body will increase according to the increase of heavy metal content in water.

Dragonfly is also a kind of insect with high ornamental value. It has bright colors. When it stops at the tip of the lotus leaf, it looks like a picture. It is very beautiful. But don't catch them at will, it will bring some harm to them.

Second, what is the function of dragonfly's tail?

The dragonfly is a very ancient insect. Its tail plays a role in maintaining body balance when the dragonfly is flying. The tail of a dragonfly acts as a mate when it breeds. We often say that dragonflies scratch the surface. In fact, dragonflies move their tails a little bit in order to lay eggs in the water. That is, when the dragonfly is flying, it touches the water with its tail to ovulate the yellow eggs.