The 3600-acre Nachusa Grasslands preserve is being restored as one of the largest and most biologically diverse grasslands in Illinois. As part of the habitat restoration, bison were introduced in 2014 to improve the ecological balance of the natural prairie. The bison roam across 1,500 acres of rolling land and are often not visible from the road. Bison can be viewed from outside the bison fenced units only. Binoculars are helpful.