Black-headed Gull, Chroicocephalus ridibundus Sarah Berger ©.	Swallow-tailed Gull, Creagrus furcatus "Swallow-tail gulls, Espanola, Punta Suarez" by Putneymark via Flickr, Creative Commons Attribution ShareAlike.
Little Gull, Hydrocoloeus minutus "Little Gull (Larus minutus)" by Dominic sherony via Flickr, Creative Commons Attribution ShareAlike.	Ichthyaetus audouinii "Gavines corses (larus audouinii) - Feliz año nuevo - Happy new year - Feliç any nou" by Ferran pestaña via Flickr, Creative Commons Attribution ShareAlike.
European Herring Gull, Larus argentatus "IMG_4819" by Gulli H via Flickr, Creative Commons Attribution-NoDerivs.	Common Gull, Larus canus Rubund Creative Commons Attribution ShareAlike.
Ring-billed Gull, Larus delawarensis "Ring-billed Gull LMO 7-15-09" by THE Holy Hand Grenade! via Flickr, Creative Commons Attribution-NoDerivs.	Lesser Black-backed Gull, Larus fuscus "Gaviota sombría Larus fuscus" by Agpov via Flickr, Creative Commons Attribution.
Great Black-backed Gull, Larus marinus Rubund Creative Commons Attribution ShareAlike.	Western Gull, Larus occidentalis Rubund Creative Commons Attribution ShareAlike.
Laughing Gull, Leucophaeus atricilla "Laughing Gull" by Glyn Lowe Photoworks via Flickr, Creative Commons Attribution.	Ivory Gull, Pagophila eburnea "Ivory Gull - Pagophila eburnea - Ísmáfur" by Omarrun via Flickr, Creative Commons Attribution.
Ross's Gull, Rhodostethia rosea "Ross's Gull (Rhodostethia rosea)" by Dominic Sherony via Flickr, Creative Commons Attribution ShareAlike.	Black-legged Kittiwake, Rissa tridactyla "Black-legged Kittiwake" by Seabamirum via Flickr, Creative Commons Attribution.

Taxonomy:

Chroicocephalus brunnicephalus (Add)
Chroicocephalus bulleri (Add)
Grey-hooded Gull, Chroicocephalus cirrocephalus (Add)
Chroicocephalus genei (Add)
Chroicocephalus hartlaubii (Add)
Chroicocephalus maculipennis (Add)
Chroicocephalus novaehollandiae (Add)
Chroicocephalus philadelphia (Add)
Black-headed Gull, Chroicocephalus ridibundus

Chroicocephalus scopulinus (Add)
Chroicocephalus serranus (Add)

Swallow-tailed Gull, Creagrus furcatus

Little Gull, Hydrocoloeus minutus

Ichthyaetus audouinii

Ichthyaetus hemprichii (Add)
Ichthyaetus ichthyaetus (Add)
Ichthyaetus leucophthalmus (Add)
Ichthyaetus melanocephalus (Add)
Ichthyaetus relictus (Add)

European Herring Gull, Larus argentatus

Larus armenicus (Add)
Larus atlanticus (Add)
Larus belcheri (Add)
Larus cachinnans (Add)
Larus californicus (Add)
Common Gull, Larus canus

Larus crassirostris (Add)
Ring-billed Gull, Larus delawarensis

Larus dominicanus (Add)
Lesser Black-backed Gull, Larus fuscus

Larus glaucescens (Add)
Iceland Gull, Larus glaucoides (Add)
Larus heermanni (Add)
Glaucous Gull, Larus hyperboreus (Add)
Larus livens (Add)
Great Black-backed Gull, Larus marinus

Larus michahellis (Add)
Western Gull, Larus occidentalis

Larus pacificus (Add)
Larus schistisagus (Add)
Larus smithsonianus (Add)
Larus thayeri (Add)

Laughing Gull, Leucophaeus atricilla

Leucophaeus fuliginosus (Add)
Leucophaeus modestus (Add)
Leucophaeus pipixcan (Add)
Leucophaeus scoresbii (Add)

Ivory Gull, Pagophila eburnea

Ross's Gull, Rhodostethia rosea

Rissa brevirostris (Add)
Black-legged Kittiwake, Rissa tridactyla

Saundersilarus saundersi (Add)

Sabine's Gull, Xema sabini (Add)