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FILE - In this Oct. 5, 1994, file photo, two bison graze in a meadow in Yellowstone National Park, Wyo. New research shows when bison heavily graze an area, the grass greens up earlier and faster and stays green for a much longer period of time. Researchers with the park and area universities say the bison are able to graze in one area for two to three months rather than having to move to higher elevations to follow new plant growth. Sensors on NASA satellites are able to observe the grassland dynamics. (AP Photo/Dave Zalubowski, File)

FILE - In this Oct. 5, 1994, file photo, two bison graze in a meadow in Yellowstone National Park, Wyo. New research shows when bison heavily graze an area, the grass greens up earlier and faster and stays green for a much longer period of time. Researchers with the park and area universities say the bison are able to graze in one area for two to three months rather than having to move to higher elevations to follow new plant growth. Sensors on NASA satellites are able to observe the grassland dynamics. (AP Photo/Dave Zalubowski, File)

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