The Caspian Gull has a long, slender bill, accentuated by the sloping forehead.

The area has given its name to several species, including the Caspian gull and the Caspian tern.

Caspian gull (Larus cachinnans)

He is credited with discovering the first British records of Caspian Gull, in Essex in the 1990s.

H. lari - Caspian gulls (Larus cachinnans)

It is sometimes considered to be part of the same species as the Caspian Gull and the combined species is then called 'Larus cachinnans'.

In Galicia (NW Spain), P. henslowii is an important food source for the Caspian gull, Larus cachinnans.

Caspian Gull and Yellow-legged Gull should be considered separate species according to a paper by Lars Jonsson in the journal Alula.

The Caspian Gull breeds around the Black and Caspian Seas, extending eastwards across Central Asia to north-west China.

Caspian Gull is a name applied to the gull taxon Larus (argentatus) cachinnans, a member of the Herring Gull/Lesser Black-backed Gull complex.

The Steppe Gull or Baraba Gull (L. (cachinnans) barabensis) may be regarded as a subspecies of the Caspian Gull or as a separate species.

It was formerly treated as a subspecies of either the Caspian Gull L. cachinnans, or more broadly as a subspecies of the Herring Gull L. argentatus.

Due to a nearby landfill site, the reservoir also plays host to a large gull population including Yellow-legged Gulls, Caspian Gulls, Iceland Gulls and Kumlien's Gulls.

On page 27, the caption to figure 14 (an illustration of the spread wingtip of a Caspian Gull) describes a "broad white tip" on p9 whereas the figure shows a broad white mirror.

The Mongolian Gull, Larus mongolicus, has previously been regarded as a subspecies of the Caspian Gull (L. cachinnans) but is now sometimes lumped with the Vega Gull.

Examples include Asian Brown Flycatcher, Long-billed Murrelet, Spectacled Cormorant, Hill Pigeon, Steller's Sea Eagle, Caspian Gull and White-naped Crane.

The Caspian Gull used to be treated as a as a subspecies of the Herring Gull but it is now treated as a full species by many authorities (e.g. the British Ornithologists' Union Records Committee).

The Mongolian Gull (L. (vegae/cachinnans) mongolicus) may be classed as a subspecies of the Caspian Gull, a subspecies of the East Siberian Gull or as a species in its own right.

Common Migrant and seasonal species include: Cattle Egret, Little Stint, Greater Flamingo, Caspian Gull, Spotted Flycatcher, Grey Heron, Dunlin, Sandwich Tern, Red and Green shanks, Ruff and White Wagtail.

It also breeds on the west side of the Black Sea; here it overlaps with the Caspian Gull but there is a difference in habitat, with the Yellow-legged Gull preferring sea cliffs and Caspian Gull on flatter shores.

In 1997, with David Quinn and Bob Glover, Garner published a two-part paper in British Birds covering the identification of Yellow-legged and Caspian Gulls, which covered the former in far greater detail than any previous published work, and contained the first detailed English-language descriptions of the latter.

It is sometimes considered to be part of the same species as the Caspian Gull and the combined species is then called 'Larus cachinnans'.

In Galicia (NW Spain), P. henslowii is an important food source for the Caspian gull, Larus cachinnans.