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Antilocapra americana
Also called (wrongly) American Antelope, the Pronghorn looks like an old world antelope and surely run as fast as them. The upperparts are tan, the lowerparts are white. The rump is white. When running from a danger, pronghorns erect the hairs of the rump to warn other individuals from the herd.
Alpine tundra of Yellowstone National Park.
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