There are those of us out there who actually enjoy looking at these frustrating birds. Because of the various plumages displayed by each species varies with age, this group of birds can be a real challenge to identify.

Assorted gull photos (more will be added soon):

Dolphin Gull (Larus scoresbii)
Laughing Gull (Larus atricilla)
Franklin's Gull (Larus pipixcan)
Little Gull (Larus minutus)
Bonaparte's Gull (Larus philadelphia)
Black-headed Gull (Larus ridibundus)
Andean Gull (Larus serranus)
Black-tailed Gull (Larus crassirostris)
Mew Gull (Larus canus)
Ring-billed Gull (Larus delawarensis)
Herring Gull (Larus argentatus)
Lesser Black-backed Gull (Larus fuscus)
Lava Gull (Larus fuliginosus)
Kelp Gull (Larus dominicanus)
Black-legged Kittiwake (Rissa tridactyla)
Ross's Gull (Rhodostethia rosea)
Swallow-tailed Gull (Creagrus furcatus)

For more photos of gulls, go to:

Martin Reid's Gull Page
Bob Lewis's Gull Page
Rudy Offereins' Gull Page, Mainly European