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550,000 furlongs per fortnight is about four-fifths as fast as a Peregrine Falcon
In other words, it's 0.847 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 1.18 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 650,000 furlongs per fortnight when diving. Falcons are sometimes sent to scare smaller birds away from airports to improve air traffic safety and were used in World War II to intercept carrier pigeons used by enemy forces.
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