This inventory was conducted to build upon prior park species lists (Adams 1909; Johnsson et al. 1982; Casper 2002, 2004) and improve inventory data for amphibians and reptiles. The study area consisted of Isle Royale National Park (Figure 1), which is a collection of over 400 islands (one large island surrounded by many smaller islands), covering approximately 54,228 ha (134,000 acres) in western Lake Superior (approximately 89 degrees west longitude and 48 degrees north latitude).