A lot of the park is a protected wilderness area, with no access for vehicles. The park in the Little River Gorge area, has one of the last natural habitats for the endangered Brush-tailed Rock Wallaby. Numbers for this species are estimated as extremely small, with the rugged terrain making it difficult to count the population. Over 250 species have been found in the park, 29 are rare or threatened in Victoria. These include the Long-footed Potoroo, Spotted Quoll (Tiger Quoll), Giant Burrowing Frog and Eastern She-oak Skink.