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The large gull complex Larus cachinnans / fuscus / heuglini / barabensis / taimyrensis
 

From The UAE Checklist:

Caspian Gull Larus cachinnans
Uncommon to locally fairly common passage migrant and winter visitor.
Confusion with Steppe Gull evident.


Lesser Black-backed Gull Larus fuscus

- Baltic Gull Larus fuscus fuscus
Rare passage migrant, September to October, return February to April; rarely other months.

- Heuglin’s Gull Larus fuscus heuglini
Common or locally common passage migrant and winter visitor; absent June to August.

- Steppe Gull Larus fuscus barabensis
Common to very common passage migrant and winter visitor.

 

Reports of L. f. taimyrensis unsubstantiated.