Hummingbirds are birds that comprise the family Trochilidae. They are among the smallest of birds. They can fly at speeds exceeding 15 m/s (54 km/h; 34 mph). They are also the only group of birds with the ability to fly backwards.
A hummingbird can rotate each of its wings in a circle, allowing them to be the only bird which can fly forwards, backwards, up, down, sideways or sit in sheer space. To hover, hummingbirds move their wings forward and backward in a repeated figure eight, much like the arms of a swimmer treading water. Hummingbirds can move instantaneously in any direction, start from its perch at full speed, and doesn’t necessarily slow up to land.