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In this Nov. 1, 2018, file photo, a bison is locked in place while receiving vaccinations and health screenings following the annual roundup, on Antelope Island, Utah. (AP Photo/Rick Bowmer, File)

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Once a year, hundreds of horseback riders gather on an island in Utah's Great Salt Lake to nudge bison toward holding pens in a roundup of one of America's largest and oldest public herds.

By RICK BOWMER, Associated Press December 26, 2018