Streaked Shearwater Calonectris leucomelas
Fairly common S Hokkaido, around Honshu, Shikoku, Kyusyu and Okinawa. Non breeding season; Dec-Feb, population decrease. Sometimes seen flock of thousands birds.
Breeding sites are confirmed on following places, but Mikura-jima (Izu Is) the largest breeding site population decreases sharply due to effect of feral cats.
Iwate Pref: Hide-jima, Sangan-jima, Funakoshi-oshima, Okama-jima, Hamaga-jima, Matori-jima, Saki-shima.
Miyagi Pref: Ashi-jima, Kasakai-jima.
Tokyo: Izu Islands; Toshima, Udone-jima, Jinai-jima, Haya-shima, Tadanae-jima, Mikura-jima, Hachijyo-kojima; Kojine, Aoga-shima perhaps Shikine-jima.
Niigata Pref: Awa-shima.
Ishikawa Pref: Nanatsu-jima.
Kyoto Pref: Kanmuri-jima, Kutsu-jima.
Mie Pref: Oshima.
Shimane Pref: Okino-shima, Shira-shima, matsu-shima, Hoshigami-jima, Ohaka-shima, Take-shima.
Yamaguchi Pref: Saba-shima.
Kochi Pref: Hime-jima, Birou-jima.
Fukuoka Pref: Okino-shima.
Nagasaki Pref: Kami-ajika-jima, Shimo-ajika-jima, Danjyo-Islands.
Oita Pref: Okiguro-jima.
Miyazaki Pref: Birou-jima.
Kagoshima Pref: Birou-jima, Uji-Islands.
Okinawa Pref: Senkaku-Islands, Nakano-ugan-shima.