Dragonflies were flying overhead at several locations at Occoquan Bay National Wildlife Refuge on Thursday, including a Common Green Darner (Anax junius), multiple Black Saddlebags (Tramea lacerata), and at least one Wandering Glider (Pantala flavescens). The Wandering Glider, alas, was elusive and I could not get an in-flight shot of it, but I did manage to get a shot of a Common Green Darner (1st photo) and a Black Saddlebags (2nd photo).
All three of these dragonfly species are migratory species. Migrating dragonflies will often fly in mixed swarms that are large enough that they are sometimes picked up by weather radars. For more details about this phenomenon, check out this September 2019 article in the Washington Post entitled “Weather radar is picking up swarms of dragonflies from the Midwest to the Mid-Atlantic.”
© Michael Q. Powell. All rights reserved.
Mike Powell 
Amazing photos…you can really see what they are all about
Nice Mike! It is tricky to get images of them in flight! Well done!