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Marian Cieslak, Auteur ; Zbigniew Kwiecinski, AuteurDans Ardea (97(4) 2009)During 2003-07, the moult of four captive Northern Hawk Owls Surnia utula was studied in Poznan Zoological Garden (Poland). The aviary was under daily observation and all breeding events were recorded. It was recognized that captive conditions d[...]
