Prairie Facts

40% of the United States was once covered by prairie.
Only 1% of original prairie exists in North America.
The major tall grasses in the prairie include big bluestem, little bluestem, Indiangrass, and switchgrass.
Prairies formed approximately 8,000 years ago.
Bison roamed the prairie in numbers up to 60 million
Fire helps revitalize the prairie. At Rexroat, the prairie is burned annually.

Sources:

prairies.org

campsilos.org