Hummingbirds fly like little helicopters. They can hover, move from side to side, go straight up, straight down, and even backwards. They do all this by rotating each wing in a circle, which is similar to the way a helicopter flies. Because they can maneuver so well around other birds, they have no fear of predators. These feisty little birds will even attack eagles if their babies are in danger-and they are not too shy to pluck fuzz off our sweaters to build their nests.