First, it means rain, which is an important way for farmers to judge the weather. Because when it rains, the humidity in the air is relatively high, and the wet air wets the wings of dragonflies, which increases the load of dragonflies and causes dragonflies to fly at low altitude.

Second, dragonflies fly low to catch food. Humidity makes some insects fly relatively low. At this time, dragonflies fly very low in order to prey.

Third, there is another situation. Dragonflies also fly low over the pond when laying eggs. The purpose is to spread their eggs into the pool water to breed the next generation.