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Monday, November 3, 2008

Dragonfly: amazing insect predator

  • Dragonflies are one of the fastest insects, flying 50 to 60 mph.
  • Dragonfly eyes contain up to 30,000 individual lenses. Human eyes only have one.
  • Dragonflies only flap their wings at about 30 beats per second (bps) compared to a bee’s 300 bps.
  • Dragonflies have two sets of wings. They don’t have to beat their wings in unison like other insects do. Their front wings can be going up while their backs ones are going down.
  • Although 80% of the brain is devoted to sight, dragonflies are not able to register detail well.
  • Excellent and strong fliers, dragonfly can loop-the-loop, hover, and fly backwards.
  • There are nearly 2500 different species of dragonflies.
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Odonata
Suborder: Epiprocta
Infraorder: Anisoptera

Dragonflies have been around 300 million years. One prehistoric fossil had a wingspan of 2 1/2 feet! Today, the largest dragonfly is found in Costa Rica. It has a wingspan of 7 1/2 inches. Below you’ll find more interesting facts about dragonflies.

Female dragonfly lay eggs sometimes as many 100,000 at a time. 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. While underwater they eat mosquito nymphs, tiny fish, and pollywogs. When they have matured to airborne insects, they catch mosquitoes and gnats in mid-air before devouring them. Surprisingly, dragonflies will spend only a very short part of their life span as actual dragonflies. They will live as nymphs for up to four years, shedding their skin up to fifteen times, yet when they finally mature into adults, the dragonfly stage, they will survive only a few months.

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