I. Black-throated Guillemot; 2. Nobbed-billed Auk; 3. Curled-crested Auk; 4. Horned-billed Guillemot

1838

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I. Black-throated Guillemot; 2. Nobbed-billed Auk; 3. Curled-crested Auk; 4. Horned-billed Guillemot