Pinguinus impennis, great auk. Plate 46 from John Gould's The Birds of Great Britain, Vol. 5 (1873) hand coloured lithograph. View the book for free via https://t.co/y8qLypIQRv

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Pinguinus impennis, great auk. Plate 341 from John James Audubon's Birds of America, original double elephant folio (1835-38), hand-coloured aquatint. Engraved, printed and coloured by R. Havell (and Son), London.

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