For the past 15 or 20 minutes, hummingbirds have been strafing each other over the feeder outside my window. Whenever one gets close enough to feed, another darts down and drives it away. There is plenty of sugar water and three sipping holes, each in the center of an imitation flower, but so far no bird has been allowed by the others to perch and feed. Hummingbirds are so cute. Sometimes they seem almost human, only they never actually hurt each other.