There are only three species in this family. They are the only frog species native to New Zealand. They are small frogs that are active at night. Scientists think they are related to the tailed frog in the Ascaphidae family -- the tailed frogs from North America. They have
nine vertebrae in the front sacrum instead of the usual eight found in other frog species. (The sacrum is the
triangular bone at the base of the vertebral column.)
