1. Dragonflies are carnivorous insects. They prey on a variety of agricultural, forestry and animal husbandry pests such as flies, mosquitoes, leafhoppers, midges and small butterfly moths. Dragonflies are an important class of natural enemy insects that are beneficial to humans.

2. Drinking water is common at streams and ponds. The larvae mostly crawl under still water to forage. It has a spoon-shaped lower lip with lateral setae and mental setae, which are sharp tools for feeding.