Insects of the genus Scophthalmus in the order Dragonflies. Dragonflies are typical partially metamorphosed insects and also have the most eyes. Dragonflies are distributed throughout China and inhabit lakes, ponds, streams, and wetlands. Dragonflies often form groups of males and females; Night falls and day comes out. Dragonflies are fierce predators, mainly preying on small fish and insect larvae. Dragonflies are one of the oldest animals living on Earth, known as the "pride of the sky". They have a slender body, bright colors, elegant posture, flexible and agile flight, and are interesting and enticing. They are one of the beloved ornamental insects by people.

Mosquitoes are small insects in the family Mosquitoidae of the order Diptera. There are approximately 3300 species of mosquitoes worldwide, with 400 species discovered in China. Mosquitoes are distributed around the world. Adults prefer to inhabit concealed, dark, and poorly ventilated places. Indoors, they often live under beds, behind cabinets, doors, in crevices in walls, as well as in animal pens and basements. Outdoors, they often live in grassy areas, caves, cellars, bridge openings, stone crevices, and other places. Female mosquitoes start sucking blood 2-3 days after eclosion, while male mosquitoes do not suck blood and feed on plant sap. Mosquitoes not only bite, suck blood, and disturb the human body, but also spread diseases. There are four mosquito borne diseases in China, namely dengue fever, Japanese encephalitis, malaria, and filariasis.