Accipitridae, Vigors, 1824

Fernandez, Juan Manuel, Thomann, Luz, Fandiño, Blas, Cajade, Rodrigo & Hernando, Alejandra, 2021, An annotated checklist of birds of Paraje Tres Cerros, Corrientes province, Argentina, Check List 17 (2), pp. 415-443 : 426

Accipitridae

Busarellus nigricollis (Latham, 1790)

Observations. ARGENTINA • 1 (no sexual dimorphism); Corrientes, La Cruz, Paraje Tres Cerros; 29° 07′14′′S, 056°56′00′′W. Registered perching near a pond .

Identification. Predominantly chesnut with pale head; frontal collar, tail, and primaries black.

Rostrhamus sociabilis (Vieillot, 1817)

Observations. ARGENTINA • 4♀ 2♂; Corrientes, La Cruz, Paraje Tres Cerros; 29°08′27′′S, 056°51′48′′W. Common in the study site. Recorded near the reservoir and near ponds .

Identification. Strongly down-curved bill, rump, and tip of the tail white. Male mostly dark gray and female brownish.