The park is also home to the tailed frog and several species of salmon. The prehistoric "Vieraella" belongs to the tailed frog family. The habitat of the tailed frog is cold, fast-moving streams with cobblestone bottoms. The tailed frog ("Ascaphus truei") exhibits internal fertilisation. Since then, the former species has been formally called coastal tailed frog. Lush riparian areas are home to the Coeur d'Alene Salamander and tailed frog.