Assertion: prairie dog | /r/CapableOf | range in the u.s.
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Source sentences:
text: In Mexico, they are mostly found in the northern states, which are the southern end of the great plains: northeastern Sonora, north and northeastern Chihuahua, northern Coahuila, northern Nuevo León, and northern Tamaulipas; in the U.S., they range primarily west of the Mississippi River, though they have also been introduced in a few eastern locales.