-
Juv/1st Winter Pale Inner pp
- HERG
- THGU
- RBGU (above)
- MEGU
-
3rd Winter
- Like Ad but no white pp tips
- Bills still like 2nd winter
-
CAGU vs HERG
- Longer pp projection
- Narrower more pointed wings
- Gray ss on UnW vs white in 3rd-4th
- Parallel edged bill
- Smaller and less bulky
- Blue-grey to yellow legs vs pink
-
CAGU vs THGU
- Longer pp projection
- Longer legs
- Bicolored vs dark bill 1st cycle
- Both have parallel edged bill
- Black vs brown wingtips 1st cycle
- No pale inner pp panel
- Black vs barred tail 1st cycle
-
CAGU vs RBGU
- Larger with longer bill
- Grayish ss below vs white
- Longer pp projection
- More black in pp in adult
- Similar mirrors in adult
- Less contrasty 1st cycle
- Brown vs white rump 1st cycle
- 2nd cycle resembles 1st cycle
- But dark vs gray gc
- Dark vs pale iris
- Blue-gray/yellow legs vs yellow
- Red orbital ring in both
-
Orbital Rings
- Yellow: WEGU
- Orange-yellow: HERG GLGU
- Orange-red: RBGU
- Red: CAGU
- Raspberry-pink: THGU
- Reddish-purple: GWGU
-
-
Juv/1st Winter Dark ss
- RBGU
- CAGU
- HERG
- THGU
- WEGU
- MEGU
-
-
-
Juv/1st winter Bicolored Bill
- RBGU
- CAGU
- GLGU
- HERG
- MEGU
- (WEGU)
-
Juv/1st Winter White Rump
-
Juv/1st Winter Pale Underwing
-
2nd Winter Pale Iris
- RBGU
- HERG (late winter)
- WEGU
- GWGU
- GLGU
-
1st Winter Pale Inner pp
- HERG
- THGU
- MEGU
- RBGU (above)
-
2nd Winter White Tail
- RBGU (98%)
- MEGU (98%)
- GLGU
-
3rd Winter Pale Iris
- RBGU
- HERG
- THGU (some)
- WEGU
- GWGU
- GLGU
-
-
2nd Winter Dark Bill
- GWGU
- LBBG (pale base below)
-
GWGU x WEGU
- Variably intermediate
- Similar to THGU or SBGU
- Bill structure is key
- Ad dusky head (unlike WEGU)
-
-
-
Adult No Black in Wingtips
-
Adult Small Black Wingtips
-
Adult Large Black Wingtips
-
-
-
Adult Large Mirrors
- CAGU
- THGU (little black)
- MEGU
-
Adult HERG vs THGU
- Larger and thicker billed
- Slightly paler above
- Blacker wingtips vs silver-grey
- Bright yellow vs dirty yellow eyes
- Shallower sloping forehead
-
3rd Cycle HERG vs THGU
- Larger and thicker billed
- Slightly paler above
- Darker wingtips & tail
- Contrastier pale panel
- Shallower sloping forehead
- Pale eye vs usually dark
-
-
LIGU
Larus minutus
- Smallest gull
- 2-3 cycles
- Adult basic:
- Pale gray above
- White wingtips & trailing edge
- Dark UnW
- Black bill
- Red legs
-
Juvenile:
- Dark M
- Dark ss and outer pp
- Smudgy cap
- Ear spots +/- connect to cap
-
Breeding:
- Eurasian
- Small population at Hudson Bay
- Winter: Great Lakes, East Coast
-
LBBG
- Larus fuscus
- Smaller, more slender v HERG
- 1st 2nd cycle very dark wings
- Pale head, dark around eye
- Pale iris by 2nd winter
- Fierce look
- Yellow legs by 3rd winter
- Ad very dark above
- Dusky head
- Extensive black wingtips
- Small mirror
- Parallel edged bill, orange spot
-
GBBG
- Larus marinus
- Largest gull
- Gray pp ss below (little black)
- Large mirrors
- 1st 2nd cycle contrasty spots
- Less periocular streaks v LBBG
- Pink legs v yellow in LBBG
-
Yellow Legs (by 2nd Winter)
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