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WikiPedia: Ô_tác_lớn http://www.flickr.com/search/groups/?w=42637302@N0... http://scienceblogs.com/tetrapodzoology/2010/04/th... http://www.birds.cornell.edu/clementschecklist/dow... http://www.proyectoavutarda.mncn.csic.es/wp-conten... http://www.cms.int/species/otis_tarda/otis_tarda_b... http://www.arkive.org/Great-bustard/Otis_tarda/ //dx.doi.org/10.1525%2Fauk.2009.08233 http://greatbustard.org/about-the-birds/ http://www.iucnredlist.org/details/106002760/0 http://animals.jrank.org/pages/652/Bustards-Otidid...