It is Dragonfly Migration time, as it is for so many birds and other insects.
There are approximately 326 species of dragonflies in the United States. Of these there are only 16-18 species that migrate seasonally some sporadically. September is peak time for migrating dragonflies.
A new collaborative, The Migratory Dragonfly Partnership, has greatly increased what is known about dragonfly migration by attaching miniature radio transmitters to the thoraxes of the Common Green Darners (pictured on the right) and follow them for up to 12 days.