Leach’s Storm-Petrel

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Leach’s Storm-Petrel Oceanodroma leucorhoa

Summer visitor; Apr-Nov. Common around S and E Hokkaido, E Honshu, Izu Is and Bonin Is. Rarely seen Sea of Japan of NW Honshu.

Breeding sites are confirmed on E Hokkaido; Habomaimoshiri-jima, Daikoku-jima (＞570,000 nests), Kenbokke-jima, Akkeshi-kojima, and Iwate Pref; Hide-jima, Funakoshi-oshima, Sangan-jima. Perhaps may breeds on Izu Is; Hachijyo-kojima and Miyagi Pref; Ashi-jima.

Fig. 1. Off Iwate Pref. 23 July 2021.

Fig. 2. Off Iwate Pref. 23 July 2021.

Fig. 3. Off Iwate Pref. 23 July 2021.

Fig. 4. Same bird as Fig. 3. 23 July 2021.

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Fig. 8. This bird has distinct dark median line in white uppertail-covert.

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Fig. 16.

Fig. 17. Presumed Juvenile. In autumn; Sep-Nov, birds with uniform flesh plumage seen and has slightly shallower forked tail than adult.

Fig. 18. Same bird as Fig. 17.

Fig. 19. Same bird as Fig. 17. Juvenile often has Japanese Band-rumped-like white uppertail-covert shape.

Fig. 20. Same bird as Fig. 17.

Fig. 21. Same bird as Fig. 17.

Fig. 22. Same bird as Fig. 17.

Fig. 23. Presumed Juvenile.

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Fig. 26. Worn bird often has white primary flash.

Fig. 27. Same bird as Fig. 26.

Fig. 28.

Fig. 29. Same bird as Fig. 28.

Fig. 30. Same bird as Fig. 28.