September 23, 2007 - Dragonfly Migration Welcome to the Nature Notebook. Birds and butterflies are not the only creatures that migrate to warmer climates in the fall. Some species of dragonflies move south for the cold winter months, too. The best known of these migratory dragonflies is the Common Green Darner, a three–inch long insect. Green Darners store fat during the summer before migrating, much like birds do. And also like birds, they take advantage of tailwinds produced by cold fronts out of the north. And just as migrating hawks use air currents along ridge tops in Pennsylvania, so do Green Darners. But, sharing the skies with migrating raptors sometimes comes with a price. American Kestrels, small falcons, often feed on migrating dragonflies in the late afternoons. Why do these dragonflies migrate? Like their feathery counterparts, these insect-eaters head south to ensure they have a continuous food supply during the winter months. This is PPL's naturalist, Jon Beam, with the Nature Notebook for WVIA.