Black-tailed Gull L. crassirostris
16th October 2002  Sakawagawa-river Odawara Kanagawa Japan
 

Juvenile



 

1st. winter



 

1st.winter
An early-molter. New first winter feathers are extending to wing-coverts, not only scapulars.



 

2nd winter



 

3rd winter.

Note the greenish grey bill/legs, brownish grey mantle, broader black band on bill and lack of white spots to the primary tips, compared with adults.

Adult winter.
Some adult winter birds often show "hooded" appearance like this in fall.



 

A normal adult winter.