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Immature Glaucous Gulls are pretty much all white
Both the aptly named Black-legged and Red-legged Kittiwakes breed in the Pribilofs. The Black-legged Kittiwake has a wide distribution all around the northern hemisphere, while the the entire world population of Red-legged Kittiwake breeds only here or nearby.
Guess which Kittiwake species this one is?
How about this one?
