An annotated checklist of birds of Paraje Tres Cerros, Corrientes province, Argentina Author Fernandez, Juan Manuel Author Thomann, Luz Author Fandiño, Blas Author Cajade, Rodrigo Author Hernando, Alejandra text Check List 2021 2021-03-08 17 2 415 443 http://dx.doi.org/10.15560/17.2.415 journal article 10.15560/17.2.415 1809-127X Plegadis chihi (Vieillot, 1817) Observations. ARGENTINA • 3 (no sexual dimorphism); Corrientes , La Cruz , Paraje Tres Cerros; 29°09′ 24′′S , 056°50′33′′W . Recorded flying over the reservoir . Identification. Differs from Phimosus infuscatus (Lichtenstein , 1823) in color. It has head, upper breast and back, reddish, with iridescent green wing feathers. Phimosus infuscatus (Lichtenstein, 1823) Observations. ARGENTINA • 5 (no sexual dimorphism); Corrientes , La Cruz , Paraje Tres Cerros; 29°09′ 49′′S , 056°51′15′′W . Foraging in wet grasslands . Identification. Overall black. Front of the head bared, reddish.