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WikiPedia: Sếu vương miện đen http://www.birds.cornell.edu/clementschecklist/dow... http://digitalcommons.unl.edu/bioscicranes/12/ http://www.birdlife.org/datazone/species/index.htm... http://www.iucnredlist.org/search/details.php/4023... http://www.nacwg.org/gruidae.htm http://www.savingcranes.org/species/black_crowned.... https://web.archive.org/web/20051120111758/http://... https://web.archive.org/web/20090106180232/http://... https://commons.wikimedia.org/wiki/Category:Balear...