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		 Several species of prairie dogs are found in open grasslands in western North America; the black-tailed prairie dog shown here is the most widely distributed.     Although they are iconic symbols of the western prairies, their current numbers are a small fraction of historic populations -- apparently some 'towns' had more than a million burrow systems and covered many square miles.      These were in the Pawnee Grasslands of northeastern Colorado, and in New Mexico; one is rather scarred on the face.     Other pages show images of two other species of prairie dogs:     the common white-tailed prairie dog and the endangered Utah prairie dog. 
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