The Okinawa rail (Hypotaenidia okinawae) is a species of bird in the rail family, Rallidae. It is endemic to Okinawa Island in Japan where it is known as the Yanbaru kuina (ヤンバルクイナ（山原水鶏）, "Yanbaru rail"). Its existence was only confirmed in 1978 and it was formally described in 1981 although unidentified rails had been recorded on the island since at least 1973 and local stories of a bird known as the agachi kumira may refer to this species.
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