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Unladen Swallows are small birds; about 7-8in in length (17-20cm), with a wing span reaching 12-14 (30-35cm).
The European Swallow (Hirundo rustica) must beat its wings 18 times per second to remain airborne (not 43 as is popularly believed). Comparing this with the average amplitude of their wing beat we come out to an average airspeed of about 11 meters per second (approximately 24 miles an hour). This is cruising speed, mind you.