520 ILCS 5/1.9

The Department shall have the power and authority to select and purchase or lease, receive by donation or acquire, in accordance with the laws relating to eminent domain: (a) suitable lands for the breeding, hatching, propagation and conservation of birds or mammals, (b) lands or lands and waters, to be used as public hunting and fishing grounds, or (c) lands or lands and waters to be used as wildlife refuges.