The Wyoming Game and Fish Department received thousands of applications for bison hunting permits this year, and invited about 400 of those to hunt.
Spokesman Mark Gocke says hunters will be helping to reduce the herd size of the largest land animal in North America. The ideal herd size is 500 bison, but there are currently 900.
Gocke says the drought has driven the bison herd from its typical summer rangeland and onto the Elk Refuge seeking forage. The herd competes with elk and other animals for food.