There are two hummingbirds at the feeder - well, trying to get to the feeder. There's some territorial fighting going on, as one (female?) is dive-bombing the other (male). They're holding themselves almost upright when they do this, like lightning bugs when they fall and climb, instead of the bodies being almost horizontal when flying. Tail-feathers are widely spread, too. All the male wants is a few sips of nectar! Which he finally got when the other one gave up.