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Ancient Murrelet Synthliboramphus antiquus
Common with breeding in Teuri-to (Hokkaido).
There are records that breed in Moyururi-to, Habomaimoshiri-to (both Hokkaido) and Sangan-jima (Iwate) in the past. In addition to this, there is a possibility they breed in Tobi-shima (Yamagata) and Awa-shima (Niigata). It is difficult to survey because their typically nest is short burrow made in cliff, the current situation is unknown in many breeding sites.
In the winter, a large number of birds come to around Japan. And a few of them are observed at sea off Kyusyu Region and Okinawa.