Dragonflies typically eat mosquitoes, and other small insects like flies, bees, ants and butterflies. They are therefore valued as predators, since they help control populations of harmful insects. Dragonflies are usually found around lakes, ponds, streams and wetlands because their larvae, known as "nymphs", are aquatic. Adult dragonflies do not bite or sting humans, though nymphs are capable of delivering a painful bite.
Female dragonflies lay eggs in or near water, often on floating or emergent plants. When laying eggs, some species will submerge themselves completely in order to lay their eggs on a good surface. Most of a dragonfly's life is spent in the naiad (that is, nymph) form, beneath the water's surface, using internal gills to breathe, and using extendable jaws to catch other invertebrates or even vertebrates such as tadpoles, fish, etc. Some nymphs even hunt on land, an aptitude which could easily have been more common in ancient times when terrestrial predators were clumsier. The larval stage of large dragonflies may last as long as five years. In smaller species, this stage may last between two months and three years. When the larva is ready to metamorphose into an adult, it climbs up a reed or other emergent plant. Exposure to air causes the larvae to begin breathing. The skin splits at a weak spot behind the head and the adult dragonfly crawls out of its old larval skin, pumps up its wings, and flies off to feed on midges and flies. The adult stage of larger species of dragonfly can last as long as four months.Classific
("Anisozygoptera")===Formerly, the Anisoptera were given suborder rank beside the "ancient dragonflies" (Anisozygoptera) which were believed to contain the two living species of the genus Epiophlebia and numerous fossil ones. More recently it turned out that the "anisozygopterans" form a paraphyletic assemblage of morphologically primitive relatives of the Anisoptera. Thus, the Anisoptera (true dragonflies) are reduced to an infraorder in the new suborder Epiprocta (dragonflies in general). The artificial grouping Anisozygoptera is disbanded, its members being largely recognized as extinct offshoots at various stages of dragonfly evolution. The two living species formerly placed there — the Asian relict dragonflies — form the infraorder Epiophlebioptera alongside the Anisoptera.
Damselflies (suborder Zygoptera) are often confused with dragonflies, but these are distinct; most damselflies hold their wings at rest together above the body or held slightly open above (such as in the family Lestidae), whereas most dragonflies at rest hold their wings horizontally or occasionally slightly down and forward. Also, the back wing of the dragonfly broadens near the base, caudal to the connecting point at the body, while the back wing of the damselfly is essentially similar to the front wing. The eyes on a damselfly are apart; in most dragonflies the eyes touch. Notable exceptions to this rule are the Petaluridae (Petaltails) and the Gomphidae (Clubtails).
In East Asia and among Native Americans, dragonflies have a far better reputation, one that can also be said to have positively influenced modern day views about dragonflies in most countries, in the same vein as the insect's namesake, the dragon, which has a positive image in the east, but initially had an association with evil in the west.
For some Native American tribes they represent swiftness and activity, and for the Navajo they symbolize pure water. Dragonflies are a common motif in Zuni pottery; stylized as a double-barred cross, they appear in Hopi rock art and on Pueblo necklaces. It is said in some Native American beliefs that dragonflies are a symbol of renewal after a time of great hardship.
In Japan dragonflies are symbols of courage, strength, and happiness, and they often appear in art and literature, especially haiku. In ancient mythology, Japan was known as Akitsushima, which means "Land of the Dragonflies". The love for dragonflies is reflected by the fact that there are traditional names for almost all of the 200 species of dragonflies found in and around Japan. Japanese children catch large dragonflies as a game, using a hair with a small pebble tied to each end, which they throw into the air. The dragonfly mistakes the pebbles for prey, gets tangled in the hair, and is dragged to the ground by the weight.
Also, in Japan, amongst the Three Great Spears of Japan is one which is called the Tonbogiri, which when translated is called 'The Dragon Fly Cutter'. The spear is an important part of Japan's imperial regalia - the spear itself was once wielded by the legendary Samurai, Honda Tadakatsu. Its name is derived from the story that the blade is so sharp, a dragonfly once landed on it and was instantly cut in half.
They also have traditional uses as medicine in Japan and China. In some parts of the world they are a food source, eaten either as adults or larvae; in Indonesia, for example, they are caught on poles made sticky with birdlime, then fried in oil as a delicacy.
Vietnamese people have a traditional way to forecast rain by seeing dragonflies: "Chuồn chuồn bay thấp thì mưa, bay cao thì nắng, bay vừa thì râm" (Dragonflies fly at low level, it is rainy; dragonflies fly at high level, it is sunny; dragonflies fly at medium level, it is shadowy).
In the United States dragonflies and damselflies are sought out as a hobby similar to birding and butterflying, known as oding. Oding, from the dragonfly's Latin species name, odonata. Oding is especially popular in Texas, where 225 out of a total of 457 known species of odonates in the world have been observed. With care, dragonflies can be handled and released by Oders, unlike butterflies.
Images of dragonflies were common in Art Nouveau, especially in jewelry designs. They have also been used as a decorative motif on fabrics and home furnishings.