U.S. Forest Service officials have set up a no-shooting zone in an area outside Yellowstone National Park where entrails from killed bison attracted large numbers of grizzly bears last year.

Gardiner district ranger Ron Hecker said that 8,000 pounds of entrails, bones and hides were removed from the Beattie Gulch area last year.

Hecker told The Livingston Enterprise that it was an "anomaly" that there was not a conflict between a bear and a hunter in the area last season.

The no-shooting zone goes into effect Dec. 1 and covers a corridor between the Yellowstone River and Old Yellowstone Road.

During Montana's 2012 bison hunt, 227 were killed, most by members of Indian tribes that hold hunting rights through longstanding treaties.