I photographed this herd of Pronghorn Sheep along the Lamar river banks in the Lamar Valley of Yellowstone National Park. The fresh snow covering the ground added to the image. The Pronghorn can run exceptionally fast, being built for maximum predator evasion through running, and is generally accepted to be the fastest land mammal in the Western Hemisphere. The top speed is very hard to measure accurately and varies between individuals; it is variously cited as up to 60 mph. It is often cited as the second-fastest land animal, second only to the cheetah. It can, however, sustain high speeds longer than cheetahs. Cougars, wolves, coyotes and bobcats are the major predators. Golden Eagles have been reported to prey on fawns.
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