My parents have been putting out humming bird feeders for about fifteen years. In the last three, the population visiting their house has exploded. Suddenly, the four feeders have to bed refilled almost once a day. During the 'hot' season (ie, right now, after they've returned from their wintering grounds and are setting up nests and sitting eggs) there's an almost constant presence at the feeders. Males establish territories around each feeder and fight each other and watch females come and drink. They're fierce little things. As my mom says, if they were the size of magpies, you wouldn't be able to hike in the woods without body armor.
I've never tried to photograph humming birds before. My lens was barely up to the task, but we made out OK.