|Third-calendar-year Yellow-legged Gull: one of at least 32 in the Rainham/Crayford area of London yesterday.|
|Adult Yellow-legged Gull yesterday: birds of this species are now actively renewing their plumage.|
|Third-calendar-year Yellow-legged Gull yesterday and, below, the same bird's right wing-tip:|
The timing of the moult is very similar to that of the adult above. Some (but not all) of this feather detail can be worked out on birds at rest, but in flight it's easier (NB this is a different 3cy bird below):
|Third-calendar-year Yellow-legged Gull in flight, showing the obvious extent of primary moult: about halfway there.|
|Juvenile Yellow-legged Gull (bird B): this individual is very similar to bird A above, but has subtly different|
patterning on eg the greater coverts and underwing, as well as a complete tail.