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WikiPedia: Saltator atriceps http://www.birds.cornell.edu/clementschecklist/dow... http://datazone.birdlife.org/species/factsheet/227... http://www.boldsystems.org/index.php/TaxBrowser_Ta... http://www.irmng.org/aphia.php?p=taxdetails&id=105... http://www.iucnredlist.org/details/22723869/0 https://www.hbw.com/species/black-headed-saltator-... https://www.itis.gov/servlet/SingleRpt/SingleRpt?s... https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwt... https://avibase.bsc-eoc.org/species.jsp?avibaseid=... https://ebird.org/species/blhsal1