Selected Gull
Species
Upperparts of adult
gulls, judged from multiple series of museum specimens
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Black-headed
Thayer's
Iceland
Bonaparte’s
Black-legged Kittiwake
Little
Glaucous
Ring-billed
Herring
Laughing
Lesser
Black-backed
Great Black-backed
Calif.
Franklin’s
Ross’s
Black-tailed
Yellow-legged
Kelp
Sabine’s
Mew
Adapted with permission
from:
“Shades
of Gray: A Point of Reference for Gull
Identification”
by Steve N.G. Howell
Birding February 2003
Kodak Gray Scale
#152 7654
Probable
Rare
Rarer
Delaware Valley Ornithological Club 12/4/03