Pomarine Jaeger

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Pomarine Jaeger Stercorarius pomarinus

Common around Japan. Non breeding and migration season; spring and autumn, population increase.

Fig. 1. Adult breeding.

Fig. 2. Adult non-breeding.

Fig. 3. Adult non-breeding.

Fig. 4. 3rd-year or Adult non-breeding.

Fig. 5. 3rd-year or Adult non-breeding. Same bird as Fig. 4.

Fig. 6. Adult non-breeding.

Fig. 7. Dark-morph 3rd-year or Adult.

Fig. 8. Dark-morph 3rd-year or Adult. Same bird as Fig. 7.

Fig. 9. 2nd-year? This bird has barred underwing coverts.

Fig. 10. 2nd-year.

Fig. 11. 1st-year?

Fig. 12. 1st-year? Same bird as Fig. 11.

Fig. 13. 1st-year?

Fig. 14. 1st-year?

Fig. 15. 1st-year? Same bird as Fig. 14.

Fig. 16. 1st-year?

Fig. 17. 1st-year?

Fig. 18. 1st-year.

Fig. 19. Juvenile.