were found on rock outcrop habitats. Ranking second was Brown County with 62 species. 48 species were found in Kewaunee County, ranking eighth. Slugs were found in all three counties. Peninsula State Park is home to the northernmost known population of Strobilops aenea. The species Vertigo hubrichti and Vertigo morsei are endemic to the upper Midwest. These two species had the highest occurrence frequencies along the Door and Garden Peninsulas. Door County is also home to several uncommon species from the genus Oxychilus'', which is non-native and introduced from Europe. One was found near a vacation home and may have been introduced by landscape plantings. Within Door County, Brussels Hill, North Kangaroo Lake, Rock Island and the scarp face with its cool algific habitat supports populations of rare snails. Out of 63 locations in Door County where snails were found, the most species (28) were located on a cliff in Rock Island. See also Door Peninsula chipmunk Peshtigo Fire Wisconsin Ledge AVA Explanatory notes References Lake Michigan Landforms of Brown County, Wisconsin Landforms of Door County, Wisconsin Landforms of Kewaunee County, Wisconsin Niagara Escarpment Peninsulas of Wisconsin Ramsar sites in the United States