A hummingbird can flap its wings about 80 times per second, causing an audible humming sound. Due to the unique structure of their wings, hummingbirds can fly left, right, up, down, backwards, or even upside down. They can also hover by flapping their wings in a figure-eight pattern. And their wings aren't the only fast-moving body part -- they have a heart rate of approximately 1,260 beats per minute!