Hummingbirds
Some birds fascinate me -- woodpecker, wren, wood thrush, and mockingbird -- but none so much as the hummingbird, especially when I delve into the amazing trivia behind these little guys [the only bird that can fly backwards, for instance].
I set up my digital camera on a tripod, aimed at the hummingbird feeder, to take a photo once a minute for an hour and a half, resulting in about five good shots of the hummingbirds as they fed. Two of these I combined in Photoshop to create what you see above.