On this first one, pause the video at the 22-second mark and you will see that the little guy on the right has a broken top beak. It doesn't seem to have hurt him; he's willing to fight with the toughest. You can enlarge the video by clicking on the square to the right of the sound thingie.
The other one is just a typical example of hummingbird wars. I really do get as close as it looks on these, because the feeder is attached to the outside of my computer room window. I can actually get as close as one foot away from them. Sorry I originally posted the above video twice; I've changed it now to the hummingbird wars.