The correct answer is option 4, the Hummingbird. Hummingbirds are known for their unique flying abilities, which include hovering in mid-air and flying both forward and backward. This is made possible by the way their wings are structured, allowing them to rotate in a full circle. Unlike other birds, Hummingbirds have the ability to flap their wings at a very high speed, ranging from 12 to 80 times per second, which enables them to generate lift and maneuver in different directions. This exceptional flying technique allows them to feed on nectar from flowers while hovering in mid-air. Other bird species, such as Sparrows, Koels, and Siberian Cranes, do not possess the same flying capabilities as Hummingbirds and are unable to fly backward.