Yellow-legged Gull atlantis
Yellow-legged Gull michahellis
Yellow-legged Gull lusitanius
Armenian Gull armenicus
Caspian Gull cachinnans
Herring Gull argentatus & argenteus
American Herring Gull smithsonianus
Steppe Gull barabensis
Heuglin's Gull heuglini
Lesser Black-backed Gull graellsii & intermedius
Lesser Black-backed Gull fuscus
Great Black-backed Gull marinus
Iceland Gull glaucoides & kumlieni
Thayer's Gull thayeri
Glaucous-winged Gull glaucescens
Kelp Gull dominicanus
Slaty-backed Gull schistisagus
Western Gull occidentalis
White-eyed Gull leucophthalmus
Black-tailed Gull crassirostris
Pallas's Gull ichthyaetus
Ring-billed Gull delawarensis
California Gull californicus
Common Gull canus
Mediterranean Gull melanocephalus
Audouin's Gull audouinii
Slender-billed Gull genei
Little Gull minutus
Black-headed Gull ridibundus
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