MISSOULA, Montana, Nov. 20 [TNSbiologyresearch-Proceedings of the National Academy of Sciences journal] -- The University of Montana issued the following news release:

On a typical June day in Yellowstone, it's not unusual to see hundreds of bison grazing in the Lamar Valley. The herds appear to aimlessly move back and forth through meadows threaded by a winding river, just passive figures in an idyllic scene. But as it turns out, that's far from the full picture.

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