Kun laughed at Yin.

Flying low is a way for insects preyed by dragonflies to protect themselves before it rains, and dragonflies want to prey on them, to paraphrase:

There is little difference between the air humidity before rain and that on sunny days. And it doesn't mean that the humidity in the air must be higher than that in sunny days before it rains. Sometimes, the humidity in the air is very high on a sunny day, causing extreme sultry weather, but at this time, dragonflies in the sky will not fly very low. It can be seen that the influence of humidity in the air on insect flight ability is not as great as people think.

The evolution of nature makes most insects have their own waterproof measures on their wings. These waterproof measures are highly reliable and practical, so that the wings of insects generally do not stick to the fog, let alone get wet by humid air. Insects must have the ability to keep flying in various humid climates to ensure their survival in the cruel natural environment. Imagine that if their flying ability is greatly affected in humid air, they will definitely be swept away by natural enemies and will never survive.

In the process of biological evolution, it must be reasonable for organisms to have some instinct, otherwise it is not necessary to evolve this instinct, and the choice of biological evolution is often the most scientific choice. The author thinks that insects choose to lower their flying height on cloudy days in order to prevent lightning damage and the impact of raindrops and hail.

It is not that insects can't fly very high in humid air, but to prevent raindrops, hail and lightning from hurting themselves, they instinctively lower their flying height before it rains. Those insects that can't fly when they encounter humid air, even if they have appeared in history, have long been eliminated by nature. In fact, the real flying masters on the earth are all kinds of flying insects, not humans. Humans are not qualified to question their flying ability in humid air at all.

So dragonflies fly low to catch those insects and fly low with them.