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References
CLEERE N (1998) Nightjars. A guide to nightjars andrelated nightbirds. Pica Press y Yale University Press,Robertsbridge y New Haven2
KÖNIG C, WEICK F Y BECKING J-H (1999) Owls: a guideto the owls of the world. Pica Press y Yale UniversityPress, Robertsbridge y New Haven

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