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139 inches per second is about one-fifth as fast as a Gazelle
In other words, it's 0.2 times the speed of a Gazelle, and the speed of a Gazelle is 5 times that amount.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 900 inches per second. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).
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