Sooty Shearwater

Sooty Shearwater Ardenna grisea

Common around Japan. Mainly migration visitor. Migration season; Apr-Jul, population increase and hundreds to thousands birds seen E Hokkaido in early summer.

Fig. 1. Adult.
Fig. 2. Presumed Adult.
Fig. 3. Adult.
Fig. 4. Juvenile.
Fig. 5. Adult.
Fig. 6. Adult.