Steppe Gull versus Caspian Gull, and a look at Heuglin's Gull

From The UAE Checklist:
Caspian Gull Larus cachinnans
Uncommon to possibly locally fairly common passage migrant and winter visitor.
Confusion with Steppe Gull evident.


Lesser Black-backed Gull complex
- 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.


 

Check out this blog by Chris Gibbins

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