Heermann's Gull
Larus heermanni
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Mew Gull
Larus canus
Ring-billed Gull
Larus delawarensis
California Gull
Larus californicus
Herring Gull
Larus argentatus
Thayer's Gull
Larus glaucoides thayeri
Western Gull
Larus occidentalius
Glaucous-winged Gull
Larus glaucescens
Glaucous Gull
Larus hyperboreus
Sabine's Gull
Xema sabini