Media type: E-Article Title: Opportunistic breeding of the Citril FinchSerinus citrinella Contributor: Borras, Antoni; Senar, Juan Carlos imprint: Springer Science and Business Media LLC, 1991 Published in: Journal für Ornithologie Language: English DOI: 10.1007/bf01640536 ISSN: 0021-8375; 1439-0361 Keywords: Animal Science and Zoology Origination: Footnote: