Streaked Shearwater

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.

Hokkaido: Oshima-oshima,
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.

Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4. There are individual differences in head collar.
Fig. 5. Molting conspicuous from mid-autumn.
Fig. 6. Same bird as Fig. 5.
Fig. 7.
Fig. 8.
Fig. 9. Off Maizuru, Kyoto Pref. Jul 15 2019.
Fig. 10. Off Maizuru, Kyoto Pref. Jul 15 2019.
Fig. 11. Off Maizuru, Kyoto Pref. Jul 26 2020.
Fig. 12. Off Miyako, Iwate Pref. Jul 23 2020.
Fig. 13. Off Shiriyazaki, Aomori Pref. Oct 19 2019.
Fig. 14. Juvenile. Off Sado, Niigata Pref. Nov 2 2019.
Fig. 15. Foraging.
Fig. 16. Foraging with Flesh-footed Shearwater and Laysan Albatrosses.
Fig. 17. On Hide-jima breeding site. Sep 11 2010.
Fig. 18. Strange bird with very dark head and hind neck. off Miyako, Iwate. Jul 8 2007.