Here is a short article and a couple recent New York Times videos on dragonflies and their superb abilities as fliers and predators of the sky.
In the first video the last 5 seconds have amazing slow-mo scenes of a frog trying to eat one one of these Odonates: good luck buddy!
In interviewing Dr. Jessica Ware in the second video you get priceless lines like:
"You'll never see a dragonfly on a a piece of jewelry eating a face off a butterfly, but that's exactly what they do."
Have you noticed autumn is a great season for them? There was quite a swarm flying at window level outside the lab this week (15th floor!)