At one point, one hummer was stubbornly trying to go to the feeder, while
 another kept dive-
bombing it repeatedly, trying to drive the first one away. At times, it s
eems like she literally flew
into the first bird and bumped it. They sparred for about 30-45 seconds,
then one flew off with
the other in hot pursuit.

Do these little fighters actually make body contact? All of this was happ
ening only 4-5 feet away
from me - I could hear their wings whirring and aggressive little cheepin
g noises from both of
them. After the aerial dogfight, there were numerous visits to the feeder
 by at least two different
birds. At one point, one perched on top of the feeder hanger and chattere
d at us, as if to say "MY
Nectar! MINE!."

Mary and all,
    I have said for years that ounce for ounce, the nastiest beast on the
planet is a hummer. It's a good thing they aren't big enough to eat us or
man would be extinct by now. I have heard them make contact many times, once
within four or five feet of me. Laura nearly got hit this afternoon by two
of them chasing like Mary described.
    Hummer wars is a good description. I often wonder if maybe they don't
get a bit drunk if you don't change the feed before it ferments some. Might
explain some of their behavior.
    Jerry