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Dragonflies (suborder Anisoptera) are heavy-bodied, strong-flying insects that hold their wings horizontally both in flight and at rest. By contrast, damselflies (suborder Zygoptera) have slender bodies and fly more weakly; most species fold their wings over the abdomen when stationary, and the eyes are well separated on the sides of the head.
The size of flying insects ranges from about 20 micrograms to about 3 grams. As insect body mass increases, wing area increases and wing beat frequency decreases. For larger insects, the Reynolds number (Re) may be as high as 10000, where flow is starting to become turbulent. For smaller insects, it may be as low as 10.
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Odonata is an order of predatory flying insects that includes the dragonflies and damselflies (as well as the Epiophlebia damsel-dragonflies). The two major groups are distinguished with dragonflies (Anisoptera) usually being bulkier with large compound eyes together and wings spread up or out at rest, while damselflies (suborder Zygoptera) are usually more slender with eyes placed apart and ...
With the advent of easy-to-use field guides and apps about dragonflies, the pursuit and study of this beautiful insect is beginning to take off. They can fly 40 mph or hover like a helicopter ...
The naiads live in the debris of the bottoms of lakes and ponds. They do not actively pursue prey but wait for it to pass by, a strategy which affords them protection from other predators. The naiads emerge from the water to make the transition to adult dragonflies at night. Adults fly from early August through October.
The desert whitetail is a medium-sized dragonfly with length of 1 + 5 ⁄ 8 to 2 inches (41 to 51 mm). It has a wingspan of 65 to 75 mm (2.6 to 3.0 in). This dragonfly has a broad abdomen.
They are very conspicuous dragonflies; seen in swarms over paddy fields, playgrounds or open areas. They fly tirelessly with typical wandering flight for hours without making any perch. [8] Their flight speed is up to 5 m/s. [20] Especially in the autumn, the wandering glider flies in large swarms, using thermals to advantage.