It’s scientific name is Odonta which means “tooth jawed”
It have it’s larval stage (Nymph) in water. Nymphs are 20-50 mm long
Female lay eggs over the water surface and they crawls out of the water after 15 times (approx) molting.It spend most of it’s life cycle in this stage (Nymph).
Nymph breathes through its anus (Yes It is true)
During Nymph stage it eats mosquito larva even tadpole.
80-90 % larva cannot change to adult stage as most of them are eaten by other insects.
Dragonfly have good vision . They have 360 degree visual acuity (eye field) with their at least 30,000 lens.
Total no of species are 5000 aprox. Atleast 500 species are found in USA.
It is one of the old animal (almost 300 million years –Dinosaur’s time)
It can fly upto 50 km /hr. They have 2 pair of wings that’s why it’s speed is much more than any other insects
Male dragonflies are aggressive to other males for partner.
They are ectotherm like any other insect (that means they cannot regulate temperature).
A single dragonfly can eat 50 to 100 mosquito daily.
one dragonfly named as “globe skinner” had migrate 11,000 milles (Indian Ocean) and it is longest migration in insect kingdom.
Dragonfly in some culture consider as good symbol.