description Holst's Frog Overview
Holst's Frog (Babina holsti) is a large frog species endemic to Okinawa Island in Japan's Ryukyu Archipelago. It inhabits clear, rocky mountain streams and the surrounding broadleaf forests. As one of the largest native frogs in Japan, it is recognizable by its robust body and long hind legs. The species is currently classified as vulnerable by the IUCN due to significant population declines caused by habitat degradation and the introduction of invasive predators such as the small Indian mongoose.
help Holst's Frog FAQ
Where can Holst's Frog be found?
Holst's Frog, or Babina holsti, is endemic to Japan's Ryukyu Islands, especially Okinawa Island and Tokashiki Island. It is associated with forested mountain streams and nearby broadleaf woodland.
How large is Holst's Frog?
Adults are generally about 10 to 12.5 centimeters long. That makes it one of the largest native frogs found in Japan.
Why does Holst's Frog look as if it has five fingers?
Its forelimb has a thumb-like structure with a hidden, spine-like claw, making the hand appear to have an extra finger. This feature is one of the species' most distinctive physical traits.
Is Holst's Frog endangered?
Yes, Babina holsti is recognized as an endangered species in Japan and is also designated as an Okinawa Prefecture Natural Monument. Habitat loss and the restricted island range are important conservation concerns.
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