Hummingbirds are the only birds that can fly backwards and upside down.
The design of a hummingbird's wings differs from most other types of birds. Hummingbirds have a unique ball and socket joint at the shoulder that allows the bird to rotate its wings 180 degrees in all directions. The shape of their wings are long, narrow and tapered, which allows them to move more quickly and easily through the air. Additionally, the shoulder and elbow joints of the wing are very close to their tiny bodies, allowing the wings to tilt and pivot. These characteristics allow hummingbirds to change flight directions in a way other birds cannot.