In the absence of burning, grazing, or other active management, native prairie can quickly deteriorate. Historically, bison grazed the prairie, wildfires occurred, and Native Americans set the grasslands on fire for a variety of reasons. They learned early on, for example, that burned over grasslands attracted bison because the regrowth was more accessible, palatable, and nutritious. Today, prescribed burning has become a widely accepted management tool for natural resource managers.