Wyoming – Bison once numbered in the millions, roaming the North American plains. Within a century, unregulated hunting and mass slaughters wiped out wild herds. Just twenty five bison remained in Yellowstone National Park in 1901. Thanks to restoration efforts the herd today numbers nearly 4,000 making it the largest, free-roaming wild herd in the country. Wyoming Public Radio's Rebecca Huntington reports that their freedom to roam only goes so far.