Japanese researcher unveils 'hummingbird robot'

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Japanese researchers said Monday they had developed a "hummingbird robot" that can flutter around freely in mid-air with rapid wing movements.

The robot, a similar size to a real hummingbird, is equipped with a micro motor and four wings that can flap 30 times per second, said Hiroshi Liu, the researcher at Chiba University east of Tokyo.

It is controlled with an

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