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WikiPedia: Diệc_đen http://www.birds.cornell.edu/clementschecklist/dow... http://files.ornithologiki.gr/docs/rarities/annual... http://datazone.birdlife.org/species/factsheet/226... http://www.irmng.org/aphia.php?p=taxdetails&id=101... http://www.iucnredlist.org/details/22696926/0 http://sabap2.adu.org.za/docs/sabap1/069.pdf https://www.youtube.com/watch?v=ZbvPcnvFGQo https://www.biolib.cz/en/taxon/id21066 https://www.itis.gov https://www.itis.gov/servlet/SingleRpt/SingleRpt?s...