Length in CM...
94-97 NORTHERN GANNET
73-76 Great Black-backed Gull
68-72 Glaucous Gull
61-64 Herring Gull
56-60 Iceland Gull
53-57 Lesser Black-backed Gull
53 CASPIAN TERN
53 SOUTH POLAR SKUA
48-53 POMARINE JAEGER
48 GREAT SHEARWATER
47-49 NORTHERN FULMAR
44-49 PARASITIC JAEGER
43-45 Ring-billed Gull
43 Ivory Gull
41-43 Black-legged Kittiwake
41-42 Laughing Gull
40-41 Black-headed Gull
37-38 Franklin's Gull
36 COMMON TERN
34-36 Sabine's Gull
33-34 Bonaparte's Gull
34 MANX SHEARWATER
30 AUDUBON'S SHEARWATER
28 Little Gull
25-30 LITTLE & BAROLO SHEARWATERs
23 LEAST TERN
20 RED-NECKED PHALAROPE
18-19 WILSON'S STORM-PETREL
15 EUROPEAN STORM-PETREL
