Correct Option: D

A humming bird 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. Humming birds can move instantaneously in any direction, start from its perch at full speed, and doesn't necessarily slow up to land.