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Bill malformation of juvenile cory's shearwaters (Calonectris diomedea borealis) on selvagem grande

AuthorsNogales, Manuel ; Martín, Aurelio; Zino, F.
Issue Date1990
CitationBocagiana 139: pp. 1-5 (1990)
AbstractDuring a ringing expedition of 1988 three juvenile Cory's Shearwaters with malformation of their bills were found among a total of 801 birds (0.375%). No adults with similar malformations vere observed, and it is suggested that these juvenile birds will die because they will not be able to capture food when left to themselves. The cause of this malformation is not known and it is suggested that other cases observed shuld be recorded in future. The hypothesis that these malformations are to polution of the sea is not excluded.
DescriptionMuseu Municipal do Funchal
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