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859.40 kilometers per hour is about two times as fast as a Peregrine Falcon.
In other words, it's 2.210 times the speed of a Peregrine Falcon, and the speed of a Peregrine Falcon is 0.4520 times that amount.
(a.k.a. Peregrine, a.k.a. Duck Hawk, Falco peregrinus)
The Peregrine Falcon can reach speeds of up to 389 kph 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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