Species: 2 – Ascaphus montanus and Ascaphus truei
Genera: 1 – Ascaphus
Tailed frogs are unique in the fact that they have a tail that they use for reproductive purposes, making them the only two frogs in North America to reproduce internally. They are found in the Northwest of Canada and the United States, from the west coast to the Rocky Mountains. Tadpoles take on average four years to metamorphose but they can take eight years.