Volunteers, partners and staff are working with over 275 species of native Illinois prairie plants to increase and improve habitat for tallgrass prairie species of all kinds. The USDA Forest Service manages a system of 155 national forests, 19 national grasslands and 1 national tallgrass prairie; and 222 research and experimental forests, as well as other special areas, covering more than 192 million acres of public land. The USDA Forest Service has evolved into a 30,000 employee agency that manages the national forests for a number of multiple uses, including recreation, timber, wilderness, minerals, water, grazing, fish, and wildlife.