Argentina, Bolivia, Brazil, Chile, Colombia, French Guiana, Guyana, Paraguay, Peru, Suriname, Trinidad and Tobago, Uruguay (B), Venezuela.
Unknown to Ecuador.
Northern Colombia through northern Venezuela, Trinidad and Guyana to Surinam. Allso southern Bolivia and southern Brazil to central Argentina and central Chile.
 
Population
Estimated population is 100,000 - 1,000,000 (2010).
Stripe-backed Bittern (Ixobrychus involucris) [XC57606]
by Douglas Meyer from Ba\u00f1ado Los Osos (Estancia Los Osos), Romang, San Javier, Santa Fe, Argentina (song)
Stripe-backed Bittern (Ixobrychus involucris) [XC174474]
by Igor Camacho from Garopaba, Santa Catarina, Brazil (song)