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African or European?
The answer to this question that has vexed mankind for centuries: 24 miles per hour for the European variety, as related in this article. This is significantly slower than the airspeed velocity of an unladen glider, which is left as an inducement for prospective Sandhill members to discover firsthand.
Fly and you will catch the swallow.
~ James Howell, Proverbs, 1659