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WikiPedia: Sếu cổ trắng http://reportages.aube-nature.com http://reportages.aube-nature.com/decouverte-des-g... http://digitalcommons.unl.edu/bioscicranes/17/ http://avibase.bsc-eoc.org/species.jsp?lang=EN&avi... http://www.iucnredlist.org/search/details.php/4891... http://www.savingcranes.org/ https://themysteriousworld.com/10-highest-flying-b... https://id.loc.gov/authorities/subjects/sh85028992 https://d-nb.info/gnd/4165488-2 https://web.archive.org/web/20100514165139/http://...