Birds
Okinawa Rail
Hypotaenidia okinawae · also called Yanbaru rail
Unknown to science until as recently as 1981, an Okinawa rail moves flightlessly across the forest floor of a single mountainous region, a discovery so late that it reveals just how deeply hidden its Yanbaru forest home remains.
Overview
The Okinawa rail, Hypotaenidia okinawae, is a flightless forest bird confined entirely to habitat within the Yanbaru region of northern Okinawa Island. Its remarkably late scientific discovery in 1981, extreme geographic restriction, and ongoing struggle against introduced predators make it one of the most conservation-significant birds found anywhere in Japan.
A discovery decades in the making
That a bird as large and distinctive as the Okinawa rail went undescribed until 1981 says as much about the remoteness of the Yanbaru forest as it does about the bird itself, a reminder of how much can remain hidden even on a populated island.
Status
Endangered, with a small and declining population confined entirely to the Yanbaru forest of northern Okinawa Island.
Okinawa Rail: common questions
When was the Okinawa rail discovered?
This species remained entirely unknown to science until 1981, a remarkably late discovery for a large, distinctive bird on a well-populated island, highlighting just how isolated and inaccessible its mountainous forest home has remained.
Where is the Okinawa rail found?
This species is confined to the mountainous Yanbaru forest region in the northern part of Okinawa Island, found nowhere else on Earth, making it one of the most geographically restricted birds in Japan.
What threatens the Okinawa rail?
This species is severely threatened by introduced predators such as mongooses and feral cats, which have driven significant population declines since their introduction to the island, despite active captive-breeding and predator-control efforts aimed at reversing the trend.
Can the Okinawa rail fly?
No, this species is flightless, relying entirely on dense forest cover and its legs to move and evade danger across its mountainous home range in northern Okinawa.