Ridgely, Robert S.; Tudor, Guy & Brown, William L. (1989): The Birds of South America (Vol.1: The oscine passerines).
The precise details of its breeding biology are little known except for a list of known host species including tyrant flycatchers in the genus Myiozetetes, Yellow-olive Flatbill, Eye-ringed Flatbill, Pied Water Tyrant and Barred Antshrike, all of which are sub-oscine passerines.
The delta is a major staging area for many species of water birds, raptors and passerines.