Why are there so many dragonflies suddenly in the sky?

There may be several reasons for the sudden appearance of many dragonflies in the sky:

1. Weather change: Dragonflies are very sensitive to weather changes. Before the rainstorm, the air humidity increases, and the dragonfly's wings will absorb a lot of water, which will increase the weight of the dragonfly, making it unable to fly normally and can only fly low. At the same time, the wet and cold air reduces the speed of metabolism in the dragonfly, which also causes the dragonfly to fly low.

2. Dragonflies fly within marriage: males have the habit of "flying within marriage" before mating. The male holds the female's head or chest with the gripper at the end of the abdomen, guides the female to make a rapid flight rotation, and then mates with the female.

3. Dragonflies are preying: the larvae of dragonflies develop in the water, and the adults prey on flying insects.

Therefore, if a large number of dragonflies suddenly appear in the sky, it may be one of the above reasons or a combination of the above reasons.