In what season do dragonflies generally come out and become active?

Dragonflies generally appear from June to November, and are more concentrated in summer. Dragonflies are generally relatively large, with long and narrow wings that are membranous, and the reticulate venation is extremely clear. Their vision is extremely keen, with 3 ocelli; 1 pair of antennae, thin and relatively short; chewing mouthparts. The abdomen is slender, flat, or cylindrical, with anal appendages at the end. The legs are thin and weak, with hooked spines, and they can catch pests while flying in the air.

Dragonflies are hemimetabolous insects. The nymph, called a “naiad”, lives in water, breathes in water with rectal tracheal gills, and prey with a highly developed face mask. It generally needs to molt more than 11 times, taking 2 years or more before it climbs out of the water along aquatic plants, and then after a final molt emerges as an adult. In water, the nymph can prey on mosquito larvae or other small animals, and sometimes members of the same species also cannibalize each other. Both adults and larvae are carnivorous, and mostly eat pests. In addition to being able to prey on large numbers of mosquitoes and flies, some adults can also prey on pests such as butterflies, moths, and bees, so they are truly beneficial insects. Before rain, they like to fly back and forth at low altitude.