Swinhoe’s Storm-Petrel

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Swinhoe’s Storm-Petrel Hydrobates monorhis

Summer visitor; mid May-Oct. Endemic. Opportunities to seen at sea are rare, because small population and foraging areas are far off from the breeding sites.

Breeding sites are confirmed on Sangan-jima (Iwate Pref); probably a few pairs, Onbase-jima (Izu Is); 280 nests in 2017, Hachijyo-kojima (Izu Is); 110 nests in 2017 , Kutsu-jima (Kyoto Pref); 240 nests in 2016, Hoshigami-jima (Shimane Pref); 13 nests in 2016, and Koyajima (Fukuoka Pref); 30 nests in 2016. Recent years, breeding has not been confirmed on Shiriyazaki (Aomori Pref) and Nanatsujima-oshima (Ishikawa Pref).

Fig. 1. Off Kyoto Pref. 8 Aug 2021.

Fig. 2. Off Kyoto Pref. 8 Aug 2021.

Fig. 3. Off Kyoto Pref. 8 Aug 2021.

Fig. 4. Off Kyoto Pref. 8 Aug 2021.

Fig. 5. Off Kyoto Pref. 8 Aug 2021.

Fig. 6. Off Kyoto Pref. 8 Aug 2021.

Fig. 7. Off Kyoto Pref. 8 Aug 2021.

Fig. 8. Off Kyoto Pref. 8 Aug 2021.

Fig. 9.

Fig. 10. Same bird as Fig. 9. Swinhoe’s has blue-grey hood.

Fig. 11. Same bird as Fig. 9.

Fig. 12. Same bird as Fig. 9.

Fig. 13. Same bird as Fig. 9.

Fig. 14. Same bird as Fig. 9.

Fig. 15. Often seen small flocks; 10＞birds, but rarely dozens of flocks seen.

Fig. 16.

Fig. 17. Off Kyoto Pref. 15 Jul 2019.

Fig. 18. Off Kyoto Pref. 15 Jul 2019.

Fig. 19. Off Kyoto Pref. 15 Jul 2019.

Fig. 20. Same bird as Fig. 19 Jul 2019.

Fig. 21. Off Kyoto Pref. 15 Jul 2019. Variable white primary flash, this bird has large white flash.

Fig. 22. Same bird as Fig. 21. 15 Jul 2019.

Fig. 23. Off Kyoto Pref. 15 Jul 2019.

Fig. 24. Off Kyoto Pref. 15 Jul 2019.

Fig. 25. Off Kyoto Pref. 15 Jul 2019.

Fig. 26. Off Kyoto Pref. 15 Jul 2019.

Fig. 27. Off Kyoto Pref. 15 Jul 2019.

Fig. 28. Same bird as Fig. 27. 15 Jul 2019.

Fig. 29. Off Kyoto Pref. 15 Jul 2019.

Fig. 30. Off Kyoto Pref. 15 Jul 2019.

Fig. 31. Off Kyoto Pref. 16 Jul 2019.

Fig. 32. Off Kyoto Pref. 16 Jul 2019.

Fig. 33. Same bird as Fig. 32. 16 Jul 2019.

Fig. 34. Off Kyoto Pref. 16 Jul 2019.

Fig. 35. Off Hatomajima Okinawa. 3 July 2022.

Fig. 36. Off Hatomajima Okinawa. 3 July 2022.

Fig. 37. Off Hatomajima Okinawa. 3 July 2022.

Fig. 38. Off Hatomajima Okinawa. 3 July 2022.

Fig. 39. Off Hatomajima Okinawa. 3 July 2022.

Fig. 40. Off Hatomajima Okinawa. 3 July 2022.