description Tailed Frog Overview
The tailed frog (Ascaphus truei) is a primitive amphibian inhabiting cold, fast-flowing streams in the Pacific Northwest of North America. It is named for a tail-like extension of the male's cloaca, which is used to achieve internal fertilization, an adaptation to its aquatic breeding environment. This trait makes it unique among North American frog species. The species is nocturnal and long-lived, feeding primarily on aquatic and terrestrial invertebrates.
help Tailed Frog FAQ
Why is the tailed frog called a "tailed" frog?
The male tailed frog (Ascaphus truei) possesses a tail-like extension of its cloaca, which it uses to achieve internal fertilization. This unique anatomical feature is an evolutionary adaptation to breeding in fast-flowing streams where external fertilization is difficult.
Where does the tailed frog live?
This primitive amphibian inhabits the cold, fast-flowing streams of the Pacific Northwest in North America. They are highly sensitive to water temperature and sedimentation, making them an indicator species for healthy forest ecosystems.
Does the tailed frog's tail fall off like a lizard's?
No, the "tail" is actually a permanent reproductive organ used by the male to transfer sperm directly to the female. It is not used for swimming or balance and is not capable of detaching or regenerating.
How do tailed frog tadpoles survive in fast-moving water?
The tadpoles have specialized sucker-like mouths that allow them to cling tightly to rocks in turbulent, fast-flowing streams. This adaptation prevents them from being swept away by the strong currents of their Pacific Northwest habitats.
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