Smith, Paul, and Roberto Derna. 2015. “ On the Status of Dusky-Legged Guan Penelope Obscura Temminck, 1815 (Aves: Cracidae) in Paraguay ”. Papéis Avulsos De Zoologia 55 (14): 211-16. https://doi.org/10.1590/0031-1049.2015.55.14.