We have the realization their populations around Japan has decreased in recent years. In the summer, Adult and Juvenile of this bird have been observed at sea off Shiretoko, Hokkaido. From the above there is a possibility they breed in Hokkaido. They can be seen at sea off the north of central Honshu in the winter.
Fig. 1. molting.
Fig. 2. molting. Same bird as Fig. 1.
Fig. 3. molting. Same bird as Fig. 1.
Fig. 4. molting. Same bird as Fig. 1.
Fig. 5. molting. Same bird as Fig. 1.
Fig. 6. molting. Same bird as Fig. 1.
Fig. 7. non-breedings. Off Sendai, Miyagi. Feb 8 2020.
Fig. 8. non-breeding. Same bird as Fig. 7. Off Sendai, Miyagi. Feb 8 2020.
Fig. 9. non-breeding. Same bird as Fig. 7. Off Sendai, Miyagi. Feb 8 2020.
Fig. 10. non-breeding. Same bird as Fig. 7. Off Sendai, Miyagi. Feb 8 2020.
Fig. 11. non-breeding. Same bird as Fig. 7. Off Sendai, Miyagi. Feb 8 2020.
Fig. 12. non-breeding. Same bird as Fig. 7. Off Sendai, Miyagi. Feb 8 2020.
Fig. 13. non-breedings. Off Sendai, Miyagi. Jan 20 2019.
Fig. 14. non-breeding. Same bird as Fig. 13. Off Sendai, Miyagi. Jan 20 2019.
Fig. 15. non-breeding. Same bird as Fig. 13. Off Sendai, Miyagi. Jan 20 2019.
Fig. 16. non-breeding. Same bird as Fig. 13. Off Sendai, Miyagi. Jan 20 2019.
