The tailed frogs are two species of frogs in the genus Ascaphus, [1] the only taxon in the family Ascaphidae / æ ˈ s k æ f ɪ d iː /. [2] The "tail" in the name is actually an extension of the male cloaca. The tail is one of two distinctive anatomical features adapting the species to life in fast-flowing streams.

Nov 16, 2022 · Tailed frogs live in cold, fast-moving, perennial mountain streams with large stone or cobble bottoms. They prefer streams with undisturbed forest canopy and no fish. They are mostly nocturnal and aquatic, but adults may forage on land during cool, wet conditions.

A Coastal Tailed Frog tadpole forages on the rocks of a small pool in a small creek in the Oregon Cascade Mountains. You can also see its unique sucker-like mouth working from the other side of the glass of a small aquarium.

tailed frog, (Ascaphus truei), the single species of the frog family Ascaphidae (order Anura). It is restricted to cold, clear forest streams of the Pacific Northwest region of the United States and Canada. It is one of many species that disappears when old-growth forests are cut.

While most frogs and toads exhibit external fertilization, tailed frogs unique in that they have internal fertilization. Female tailed frogs purposefully attach their eggs to the bottom of big rocks or boulders found submerged in the stream.

Coastal tailed frogs are primarily found in or associated with relatively cold, clear, rocky steams in mature forests. All life stages are adapted for life in fast flowing streams. Present year-round in and near streams.

Mar 14, 2025 · Tailed frogs, scientifically known as Ascaphus truei and Ascaphus montanus, represent a living link to the early evolutionary history of frogs. These small amphibians (growing to only 1-2 inches) inhabit the cold, clear, and swift-flowing streams of the Pacific Northwest of the United States and Canada.

Tailed frogs have unique morphological adaptations to life in fast-flowing mountain streams. They are the only frog species in North America that breed in cold mountain streams. Adults and juveniles are small (2.2–5.1 cm) with a large head, a vertical pupil, and …

Nov 15, 2022 · Explore the information available for this taxon's timeline. You can select an event on the timeline to view more information, or cycle through the content available in the carousel below. Nov 15, 1994 Listing. ETWP; Animal Candidate Review for Listing as Endangered or Threatened Species. Nov 17, 1995 NEPA - EIS.

Tailed frog is an amphibian that can be easily recognized by the presence of tail. There are two species of tailed frog that inhabit northwestern and southeastern parts of North America. They can be found in Montana, Idaho, California, Washington, Oregon and British Columbia.