2cy Heuglin's Gull L heuglini

This type of bird, with pale grey scapulars and a mix of worn brownish and fresher, pale grey wing coverts, is the most common type found among the birds photographed in Russia.

Another example of the common type of bird.

A bird that has undergone a more restricted moult on the wintering grounds.

An individual with many retained juvenile coverts.

This bird has retained all of its juvenile wing coverts.

A bird with a high percentage of bluish-grey, adult-like feathers.

A bird with very well-preserved juvenile remiges.

The outer primaries of this individual have been renewed.

This individual has replaced many primaries.

A bird that has replaced all primaries on the wintering grounds.

This individual has more marked upperparts than the previous birds and so is very similar to western Lesser Black-backed Gulls.

Another 2cy Heuglin's Gull with very fresh juvenile feathers.

A more boldly marked individual.

Another boldly marked bird; this one also has several new primaries.

A darker individual that will be difficult to separate from western taxa.