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CITY, N.D. (AP) — More than 200 bison were rounded up at the north unit of Theodore Roosevelt National Park this week, in the first such operation in six years.

The 225 animals were collected over the past few days with the help of a helicopter, herding them into the holding pens at the park.

All of them were tested for disease, tagged for easy identification in the future and will be released back into the park.

Some excess animals will be given to various groups including American Indian tribes and the National Buffalo Museum’s herd in Jamestown.

The park’s chief biologist, Blake McCann, says he’d like to ramp up the frequency of the roundups to improve the long-term health of the bison herd.