One is very aggressive. He apparently feels that the feeder is his personal property, and whenever others show up, he chases them away, twittering loudly. He then returns to the feeder, perches on it, and chirps, as if to say, I won again.
Another is quite cautious. He flies in circles around the feeder, finally landing, but can't seem to sit still long enough to drink. He keeps jumping into the air, turning himself around in circles, as if watching for the aggressor.
I've read a little about these birds. They are attracted by the color red. They "know" how long a blossom takes to refill its cup with nectar after a feeding, and won't return to that blossom until it has had time to refill.
The little aggressor doesn't know that we keep the feeder replenished, and that whenever he returns, there is always more nectar.
I guess sometimes we are like that with God; our human nature can't encompass the unending bounty of God's love and care for us, so we worry and fret, instead of waiting on the Lord to supply our needs.
His eye is on the sparrow, and I know He watches me.