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WikiPedia: Sylvia http://ibc.lynxeds.com/family/cisticolas-allies-ci... http://www.vogelstimmen-wehr.de/vogstim2.htm http://www.birds.cornell.edu/clementschecklist/dow... http://animaldiversity.ummz.umich.edu/site/account... http://www.itis.gov/servlet/SingleRpt/SingleRpt?se... http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwta... //dx.doi.org/10.1111%2Fj.1463-6409.2008.00374.x http://www.faunaeur.org/full_results.php?id=97167 https://commons.wikimedia.org/wiki/Category:Sylvia... https://species.wikimedia.org/wiki/Sylvia?uselang=...