Species: Anax junius

false - false - true - This species is one of the few North American dragonflies that migrates and is therefore most common in the spring and fall. Migration may be triggered by seasonal warm fronts. Massive swarm migrations (1.2 million individuals) have been documented in Illinois, New Jersey, and Florida (Russell et al., 1998). Migrants from the south are some of the first dragonflies seen in spring and southbound swarms in Massachusetts in early fall may have thousands of individuals (Nikula et al., 2003). It generally arrives in Minnesota in late April and breeds primarily in marshy lakes and ponds. A new generation of adults fly south in September (Haarstad, 1997). There is evidence that the migratory movements are strongly influenced by seasonal warm fronts (Abbott, 2005).