There are several other taxonomically unclear examples that belong in the same superspecies complex, such as Yellow-legged Gull (L. michahellis), Glaucous Gull (L. hyperboreus), and Caspian Gull (L. cachinnans).
Caspian Sea | Prince Caspian | Kelp Gull | The Chronicles of Narnia: Prince Caspian | Pacific Gull | Gull | Caspian Tern | Yellow-legged Gull | Sooty Gull | Prince Caspian (character) | gull | Black-billed Gull | Silver Gull | Red-billed Gull | Percival Gull | Mediterranean Gull | Grey Gull | Franklin's Gull | Caspian Gull | Caspian Flotilla | Astrakhan-Caspian Military Flotilla | Western Gull | Trans-Caspian Gas Pipeline | The ''Larus'' gulls interbreed in a ring around the arctic. 1: Lesser Black-backed Gull | Sir William Gull, 1st Baronet | Sabine's Gull | Olsenbanden tar gull | lesser black-backed gull | kelp gull | Heuglin's Gull |
Caspian Gull and Yellow-legged Gull should be considered separate species according to a paper by Lars Jonsson in the journal Alula.