Science & Nature - Science & Nature: In The Air, _______ Are Powerful Flyers, Beating Their Wings 300 To 400 Times A Minute To Achieve Speeds Up To 40 Mph (64 Kph)

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Science & Nature: In The Air, _______ Are Powerful Flyers, Beating Their Wings 300 To 400 Times A Minute To Achieve Speeds Up To 40 Mph (64 Kph)

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