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Hummingbirds also stop and accelerate instantly, lift straight up and down and pivot while hovering. Hummingbirds can even escape quickly from a flower by flipping into a backwards summersault where they briefly fly in reverse while upside down!
Hummingbirds
When a hummingbird flies forward, it's wings beat up and down in a very slight circling motion. The wing is constructed of mostly primary feathers and the tilt and rotation at the shoulder allows the up-stroke to propel the hummingbird forward with as much force as the down-stroke.
Hummingbird flight is more diverse than other kinds of flight. There are evolutionary strengths that allow hummingbirds to fly forward, in reverse and maneuver sideways as breezes blow the flowers. A scientific test showed that hummingbirds are able to hover for as much as 50 minutes in one place – a strength that allows them to gather nectars tirelessly.
This means that a hummingbird has two thrust strokes to every one of another bird. In other birds, the upstroke is a passive stroke – designed only to lift the wing into position.
http://www.nectarartprints.com
Flight
