Stream Bluet Damselfly - Enallagma exsulans
Order Odonata (Fabricius, 1793) -- libélula / Suborder Zygoptera Selys, 1854 -- damselflies, demoiselles
Family Coenagrionidae -- narrow-winged damselflies / Genus Enallagma (Charpentier, 1840)
Live adult damselflies photographed in the wild at Winfield Illinois, USA.

This female Eastern Pondhawk Dragonfly is dining on Bluet Damselfly

Order Odonata: Dragonflies and Damselflies date back 300 million years, to the Carboniferous Period of the Paleozoic Era. Today, there are about 450 North American species, and 5,000 in all. They have evolved in to highly efficient hunters; their freely moveable heads sport huge compound eyes -- in the case of the dragonfly, the eyes nearly cover the entire head -- and their sharp biting mouthparts, coupled with their four powerful, independent wings make them extremely agile flyers capable of snatching prey in midair. These insects cannot fold their wings flat against the body - dragonflies hold them straight out to the sides, damselflies hold then vertically toward the rear. Both families mate in flight and lay their eggs in or close to the water. The mating ritual involves some peculiar acrobatics called a mating "wheel."

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