BILLINGS, Mont. (AP) — At least 100 Yellowstone National Park bison have been trapped in southwestern Montana corrals as the National Park Service works to reduce herd sizes.

Trapped bison will be shipped to slaughter facilities so the meat can be distributed to designated Native American Indian tribes.

The Park Service wants to reduce the park's northern bison herd that numbers about 4,000 by between 900 and 1,400. They migrate from the park to an area in Montana during the winter.

After bison cross the park boundary into Montana they become fair game for licensed state hunters and tribal members with treaty hunting rights.

So far this winter, tribal hunters have taken 80 bison and state hunters have harvested 19.

Yellowstone's total bison population is about 5,500.

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