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The 80 acre Wolf Road Prairie Nature Preserve is known for three types of rare native ecosystems: prairie, savanna and wetland. Over 360 species of native plants have been recorded at the preserve - some of these are federal and state threatened and endangered species. More than 130 species of birds use the preserve for migratory stopovers and nesting sites. Wolf Road Prairie is a nominated National Natural Landmark. This original natural area dates back to the retreat of the last glacier over 12,000 years ago. Wolf Road Prairie is considered the finest and largest black soil prairie east of the Mississippi River and is ranked globally imperiled according to the Chicago Wilderness Biodiversity Recovery Plan. The black soil savanna at Wolf Road Prairie is classified as globally critically imperiled according to the Chicago Wilderness Biodiversity Recovery Plan and represents one of only two existing grade B savannas in Illinois. No grade A savannas remain.