I keep at least 2 somtimes 3 feeders outside at all times during the summer for them, they are very interesting creatures. We have at least 3 pairs that frequent the feeders, so it's fun to sit on the deck and watch them feed and chase each other around. Almost got zapped in the forehead one day when I walked around the corner of the house, they were chasing each other and not paying attention to where they were going....
When I was stationed in San Diego, outside my office window there was a hummingbird defending what it considered it's territory. I traced a large capital D in its flight. It would start at the bottom, where the curve and the straight stroke meet. Then it would bow up and out, gaining altitude for its swoop and then, drop straight down on dogs, cats, people. Fearless little birds.
They come right up to within 1 foot of me when I'm sitting on the deck watching them.... Guess they are wondering what the hell that ugly thing is..... LOL....