A weird 1st-winter Herring Gull Larus argentatus

Larus argentatus
2cy Herring Gull L. argentatus at Tara dump 12.4.2008. Foto: Hannu Koskinen
The moult pattern of 1st-w. argentatus can be variable, but usually they moult the mantle and most of the scapulars during July-November.
Some most advanced ones can moult also few coverts, but the most slowest can be in full juvenile plumage during winter.

Larus argentatus
2cy Herring Gull L. argentatus at Tara dump 12.4.2008. Foto: Hannu Koskinen
However, this bird has renewed some coverts and tertials.

Larus argentatus
2cy Herring Gull L. argentatus at Tara dump 12.4.2008. Foto: Hannu Koskinen
And first of all: several primaries have been renewed also! Accidentally lost feathers, or? The primary moult of HGs begin from end of April on.

Larus argentatus
2cy Herring Gull L. argentatus at Tara dump 12.4.2008. Foto: Hannu Koskinen
Also the whole tail is renewed!

Larus argentatus
2cy Herring Gull L. argentatus at Tara dump 12.4.2008. Foto: Hannu Koskinen
Primaries 3 and 5 are new on the left wing.

Larus argentatus
2cy Herring Gull L. argentatus at Tara dump 12.4.2008. Foto: Hannu Koskinen
And primaries 4-6 on the right wing.

Larus argentatus
2cy Herring Gull L. argentatus at Tara dump 12.4.2008. Foto: Hannu Koskinen
All scapulars are new. What a weirdo!

Larus michahellis
Here is a 2cy Yellow-legged Gull L. michahellis for comparison. Note plenty of moulted inner coverts and tertials.
Portovenere, La Spezia, Liguria, Italy 27.3.2008. Foto: Hannu Koskinen

Larus michahellis
2cy Yellow-legged Gull L. michahellis, which has moulted 4 tail feathers during winter.
Portovenere, La Spezia, Liguria, Italy 27.3.2008. Foto: Hannu Koskinen

Larus michahellis
Another 2cy Yellow-legged Gull L. michahellis, which has moulted tail feathers during winter. It seems to be pretty common feature of michahellis.
Note the different pattern of new tail feathers compared with the Tara "weirdo".
Portovenere, La Spezia, Liguria, Italy 27.3.2008. Foto: Hannu Koskinen