Dragonfly

A few days ago a blue dragonfly visited the yard.
It was a magnificent creature, and not easy to sneak up on and photograph.
The head was almost completely coverd with compound eyes, and the abdomen (that's the tail) looked like some kind of Navajo jewelry. Actually, the whole bug looked like it was sculpted from turquoise stone.
If you click on the image, you'll notice that all six legs are mounted to the thorax as far forward as possible, giving the dragonfly the ability to more effectively capture other flying insects in mid air.
As beautiful as they are, these insects are fierce predators.
I remember about ten years ago there was a product on the market that was designed to deter mosquitos.
How did it work?
By emitting a small sound that resembled the beating of dragonfly wings. I don't know if it worked, but if I were a mosquito, I'd stay the heck away from one of these little flying monsters.