Eastern Pondhawks have taken over the yard. Every available perch is occupied, every patch of grass claimed. Active and aggressive, they patrol one area for five or ten minutes, then attempt to move on. It’s hard to say who wins the resulting bouts of mid-air combat, because I have trouble distinguishing individuals. But it seems to me as if territories steadily shift, so that one dragonfly might begin her morning in the southwest corner, move by noon into the northeast corner, then rotate back to her southwest starting position by evening. As she moves, others crowd in behind her, so that the entire yard is continuously occupied.
Fortunately for all the other dragonflies, the Eastern Pondhawks appear to prefer ground-level hunting and rarely move into the trees.