"Lengthy breeding season with,with laying Feb-Sept in Venezuela;in S of range nests in austral spring,with egg in September...in Argentina." (HBW,2,p.174)
Resident over most of its range, with a high degree of territorial fidelity. Apparently migratory in South of range, with very large individuals of the southern population reported in Colombia during the austral winter. Most common along Paraguay River in June, when probably attracted by more abundant prey associated with high water levels. Transition between resident and migratory populations undocumented.