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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.
www.pbs.org

They are swarming around my mom's house now days which keeps her busy every day feeding them.

Nice. It must be a pretty sight, colorful eye-catching creatures.

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