You probably have no idea that migratory dragonfly species exist—and that’s because even researchers don’t know a whole lot about them. And yet, North America may have up to 18 migratory dragonfly species. If you do know about dragonfly migration—first of all, we’re impressed—secondly, you’ve likely heard about the common green darner (Anax junius). It’s the best-known migratory dragonfly in North America, even though some members of the species stay local. While no known migratory dragonfly species in North America are endangered right now, the enduring mystery of dragonfly migration complicates management and conservation efforts.