Fighting at Feeders
Tiny hummingbirds are aggressive for a good reason: When blossoms are scarce, they can't afford to share. They may have to fly far to find more.
That's why hummer aggression deeply ingrained. They don't realize that the nectar in feeders doesn't need to be defended — because people keep the feeders filled!
"Our class spotted two male hummingbirds fighting over the feeder."
Second Graders at Oxford Elementary in Mississippi (August 27, 2012)