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Most hummingbirds flap their wings about 50 or so times a second (3,000 per minute). This means all we can see is a blur. A Hummingbird flaps it's wings 50 to 200 times per second.
You can tell how fast a hummingbird beats its wings by measuring the pitch of the humming noise. There are numerous recordings and videos of hummingbirds on the web, and the pitch of the hum of ruby throated hummingbirds measures at 40 - 60 cycles (= beats) per second.