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Bonaparte's gull
Larus philadelphia
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Franklin's gull
Larus pipixcan
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Franklin's gull
Larus pipixcan
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Franklin's gull
Larus pipixcan
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black-headed gull
Larus ridibundus
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black-headed gull
Larus ridibundus
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Saunders's gull
Larus saundersi
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slaty-backed gull
Larus schistisagus
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glaucous gull
Larus hyperboreus
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slaty-backed gull
Larus schistisagus
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slaty-backed gull
Larus schistisagus
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Thayer's gull
Larus thayeri
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Thayer's gull
Larus thayeri
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Thayer's gull
Larus thayeri
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Thayer's gull
Larus thayeri
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dolphin gull
Leucophaeus scoresbii