How to raise dragonflies?

Prepare a big fish tank with some sand at the bottom. You can put some stones, shrimps and fish in the water. The stone should be above the water, so that the little dragonfly can stop and rest. The mouth of the fish tank should be covered with a breathable net to prevent small dragonflies from flying out. You can eat the new prawn (prawn) meat.

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. It can be used to monitor environmental pollution and has medicinal, edible and ornamental values.

wing

The research on dragonfly wings mainly focuses on mechanical principles and bionics. Dragonfly wings have two special structures: wing knots and wing moles, which make it an excellent flier in nature.

In the study of mechanics, it is found that the dragonfly's wings will be affected by horizontal force, vertical force, moment, bending and movement when flapping and turning in the air, and it is found that the slow flight of dragonfly is very similar to that of an airplane.

The research methods of flight mechanics of dragonfly wings are also constantly improving, from tying with ropes to shooting with high-speed cameras and then observing in wind tunnels. More and more advanced methods make the study of dragonfly flight mechanics deeper.

Living habits

Dragonflies have strong flying ability and sound predation function; Dragonflies fly fiercely, flying back and forth quickly in the mountain stream, catching prey.