Argentina (B), Bolivia (B), Brazil (B), Paraguay (B).
Eastern Bolivia (Santa Cruz), western Paraguay and southern Brazil (southern from Mato Grosso and Goiás) to southern Argentina (Mendoza and Río Negro); no definitive records from Uruguay, where probably occurs.
 
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is 250 - 999 (2010) and decreasing.
Status EN
Habitat destruction through mechanised agriculture, intensive cattle-ranching, afforestation, invasive grasses, excessive use of pesticides and annual burning, and hunting are the main threats.
For more information see BirdLife International Species Factsheet.
Chaco Eagle (Buteogallus coronatus) [XC46843]
by Bernabe Lopez-Lanus from Bajos Submeridionales (Monte de La Viruela y Canal Parana)_Los Amores_Santa Fe, Argentina (call)
Chaco Eagle (Buteogallus coronatus) [XC735273]
by Nunes D\u00b4Acosta from Goi\u00e2nia, Goi\u00e2nia, State of Goi\u00e1s, Brazil (song)
Subspecies
Closely related to Buteogallus. Sometimes considered to include Black Solitary Eagle (Buteogallus solitarius).
No subspecies.
Similar Species
Great Black Hawk (Buteogallus urubitinga) which lacks a crest, is smaller and shorter-winged. Adult blacker, immature more heavily streaked brown below.
References
See References.