Dragonflies were mastering flight three hundred million years before the first bird. They hunt with incredible precision, live most of their lives unseen underwater, and one of them holds the record for the longest migration of any insect on earth. They are also a living verdict on the health of your water, and one of the very few wild wonders you can summon to your own patch by digging a simple pond with shallow margins and a few plants. A dragonfly hangs in the air at the e