|   Herring Gull (Larus argentatus)
 |   American Herring Gull (Larus smithsonianus)
 |   Vega Gull (Larus vegae)
 |   Caspian Gull (Larus cachinnans)
 | 
|   Mongolian Gull (Larus mongolicus)
 |   Yellow-legged Gull (Larus michahellis)
 |   Azores Gull (Larus michahellis atlantis)
 |   Lesser Black-backed Gull (Larus fuscus)
 | 
|   Heuglin's Gull (Larus heuglini)
 |   Taimyr Gull (Larus taimyrensis) or Birula Gull (Larus birulai)
 |   Great Black-backed Gull (Larus marinus)
 |   Slaty-backed Gull (Larus schistisagus)
 | 
|   Slaty-backed Gull / Western Gull?
 |   Glaucous-winged Gull (Larus glaucescens)
 |   Glaucous Gull (Larus hyperboreus)
 |   Iceland Gull (Larus glaucoides)
 | 
|   Thayer's Gull (Larus thayeri)
 |  Audouins Gull / Rödnäbbad trut (Larus audouinii)
 |   Black-tailed Gull (Larus crassirostris)
 |   Common Gull (Larus canus)
 | 
|   Kamchatka Gull (Larus canus kamtschatschensis)
 |   Ring-billed Gull (Larus delawarensis)
 |   Black-headed Gull / Skrattmås (Chroicocephalus ridibundus)
 |   Mediterranean Gull (Larus melanocephalus)
 | 
|   Laughing Gull (Larus atricilla)
 |   Little Gull (Larus minutus)
 |   Ivory Gull (Pagophila eburnea)
 |   Kittiwake (Rissa tridactyla)
 | 
|   Sabine's Gull (Larus sabini)
 |   Saunders's Gull (Larus saundersi)
 |  Relict Gull / Reliktmås (Larus relictus)
 |   Larus sp.
 |