How do dragonflies know the weather?

The change of air pressure and humidity before the weather changes will cause dragonflies to change their normal flight trajectory and habits.

The flight of dragonflies also indicates the change of weather. Dragonflies usually like to come out in Chu Qing before or after it rains. As the saying goes, "Dragonflies fly low and hemp fibers emerge". In other words, when dragonflies fly in groups at low altitude, it indicates rainy weather.

In rainy weather, the air humidity is high, and the wings of small insects are so wet that they can't fly high. Dragonflies feed on small insects. Rainy weather is just right for dragonflies to hunt.

Extended data:

Animals that predict the weather:

1, fish

Fish live by breathing oxygen dissolved in water. On sunny days, when the atmospheric pressure is high and there is a lot of dissolved oxygen in the water, it quietly sinks to the bottom; Before it rains, the air pressure is low, the oxygen in the deep water is greatly reduced, and the fish float to the surface to breathe, so there is a saying that "when a fish dives, it will rain". ?

2. Swallow.

There is a folk saying that "it will rain when swallows fly low". This is because swallows eat worms. When it rains, there is a lot of water vapor in the air, and the wings of insects are wet, so they can only fly close to the ground. Secondly, when the weather turns rainy, the air pressure will become lower, the water vapor in the air will increase, and some insects in the soil will crawl out of the soil. If it is a swallow, it will fly very low to catch insects. ?

Baidu encyclopedia-animal omen of weather change