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hummingbirds take nectar from flowers. they do this in a pecking motion and have to fly from flower to flower very quickly. this is impossible unless they fly backwards, or their momentum would carry them too far.
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. Hummingbirds can even fly short distances upside down, a trick rollover they employ when being attacked by another bird. ---- That was from Snapple Facts! Yes it is the only bird that fly backwards.

Like has been said - the humble hummingbird.

All other birds get their life/power on the downstroke, which means they essentially fall, then use power to lift themselves up on the downstroke.

The hummingbird flies very differently. It get power from both the down and upstroke. This means it can do things no other bird can do - stay perfectly still in space, fly backwards, forwards, sideways, upsidedown, and everything inbetween. They can stay in exactly one spot for 5 minutes while feeding, then zip to the next tree in the blink of an eye. But this capability comes at a price.

For most birds, the downstroke requires a large energy expenditure, and the upstroke requires very little energy. The hummingbird gets no break - it expends a huge amount of energy on both strokes. For that reason, the hummingbird spends more energy, and eats more, than any other animal. If we ate as much as the hummingbird, we would be eating about 30,000 calories a day. In fact, the hummingbird has to eat late into the night and rise very early in the morning - if it sleeps too long, it could starve to death. The hummingbird also has the largest heart in proportion to its body, and has the highest heartbeat rate (something like 200 beats per minute at rest and 1000 in flight).

Despite all that, hummingbirds live a surprisingly long time - roughly 15-20 years or more, which is very long for such a calorie-burning machine.

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