GULLS. ii! 
BLACK-HEADED GULL. Larus ridibundus, Linneus. 
A local resident, migratory in spring and autumn. 
KITTIWAKE. Larus tridactylus, Linneus. 
A local resident, to a certain extent migratory. 
COMMON GULL. Larus canus, Linneus. 
The same remark applies to this species as to the 
last named. 
ICELAND GULL. Larus leucopterus, Faber. 
A winter visitant, but not common. 
HERRING GULL. Larus argentatus, Ginelin. 
Resident, and the most widely distributed of all our 
Gulls. 
GLAUCOUS GULL. Larus glaucus, Gmelin. 
A winter visitant; more numerous in Shetland, 
Orkney, and the east coast of Scotland. 
GREATER BLACK-BACKED GULL. Larus marinus, 
Linneus. 
Resident, but more particularly confined to the 
north and west coasts. 
LESSER BLACK-BACKED GULL. Larus fuscus, Lin- 
nus. 
Resident ; more numerous in the north. 
