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Keywords from Image Description:
CBBM . Speotyto cunicularia Mol Molina en Burrowing Owl tips of outer primaries from ventral left and beak from lateral right Catalogue of the birds in the British Museum archive org Vol Page creator John Gerrard Keulemans Richard Bowdler Sharpe text PDold CBBM Athene cunicularia illustrations Strigidae anatomy Beaks Bird