The airspeed velocity of an unladen swallow is roughly 20.1 miles per hour. 

This is determined by calculating the Strouhal to determine the bird's airspeed. A Strouhal number is defined as St = fstD/U, where fst is the vortex shedding frequency (or the Strouhal frequency) of a body at rest, D is the diameter of the circular cylinder and U is the velocity of the ambient flow.
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