sign The Nachusa Grasslands planning process called for running up to 100
American bison (
Bison bison, also commonly known as "buffalo") on approximately of the preserve. The bison were added to the approximately 700 species logged at the prairie. In April 2015, free-range bison calves were born, adding to hope that the Nachusa herd could be managed so as to be self-sustaining. , 14 calves have been born at Nachusa. By 2023, the summer herd size was 120-130 and the winter herd size was 90-100. ==Visitor center==