Transcripts for KPIX CBS Evening News With Scott Pelley 2015

organization that's trying to bring the prairie back to the land of lincoln. seeding 1,500 acres with natural grasses and plants, from wild lupin to prairie smoke to golden alexanders. restoring the rolling hills to the way they looked 200 years ago or more.th and adding one more rather hairy ingredient to the mix. the american bison.he how long ago were bison here as a natural phenomenon? >> the last wild bison in illinois was killed about 200 years ago. >> reporter: the bison serve an important purpose here, kind of like landscapers. they maintain the prairie by eating the grass like furry lawn mowers that swallow what they cut. how are they doing? >> they're doing great. they've coped very well. they seem to be peaceful content. >> reporter: they were trucked to illinois's nachusa prairie from wind cave national park in

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