Grizzly bear chases mountain biker near Island Park area Share This Grizzly bear stock footage, EastIdahoNews.com ISLAND PARK — A mountain biker avoided injury after being chased by a grizzly bear near Island Park Friday morning. The U.S. Forest Service for Caribou-Targhee National Forest posted on Facebook and said a female grizzly bear was sighted in the Stamp Meadows Road area. The bear chased the biker but did not catch or hurt him. “We did confirm bear tracks in the area,” said Curtis Hendricks, Regional Wildlife Manager for the Upper Snake Region for the Idaho Department of Fish and Game.