Derechos de autor 2011 ACTA ZOOLÓGICA MEXICANA (N.S.)
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We provide evidence of the presence of 18 additional bird species to the avifauna of the state of Hidalgo (including an alien species). We also provide information of 14 outstanding or recent records of species previously recorded in the state. To date, the confirmed presence of 496 native bird species constitutes the species richness of Hidalgo, in addition to 6 introduced alien species.