The beautiful dragonfly - fastest insect in the world clocking in at flight speeds of 60 mph. The exact purpose of a dragonfly's iridescent coloring is not determined but may relate to attracting a mate as well as be the by-product of light scatter from the way their bodies are formed to be so aerodynamic.
Not posetive but I'm pretty sure this isn't a dragonfly bit actually a damselfly. Damselflies are thinner and told to hold their parallel against the body. They are basically dragonflies but more dainty.