Like monarchs, green darner dragonflies partake in long distance migration over multiple generations. The 1st generation hatches near the Gulf Coast, then migrates north to lay 2nd generation eggs in the upper US & lower Canada. Some of the 2nd generation nymphs overwinter in northern waterbodies, while others emerge as adults and travel south, back around the Gulf of Mexico. It is these individuals that lay non-migratory 3rd generation eggs that start the cycle over again. This video of green darner migration was taken September 1st, 2019.
The first link below provides greater detail on green darner migration thanks to the help of citizen scientists across the country. The 2nd link provides information on how to track dragonfly occurrence as a citizen scientist, which will lead to a greater understanding of dragonfly natural history.
https://www.smithsonianmag.com/smart-news/dragonfly-undertakes-epic-multi-generational-migration-each-year-180971190/
http://www.migratorydragonflypartnership.org/uploads/_ROOT/File/MDP-Monitoring_Protocols.pdf
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