$Eudocimus [albus] ruber Sibley & Monroe,1990,Distribution and Taxonomy of Birds of the World,p.311.
forest and savanna rivers and ponds;lowlands-2000m
"Early in wet season in Venezuela and Colombia;rather continuous during all rainy season;ealy summer (October-December) in SE Brazil." (HBW,1,p.500)
Not well known,but movements related to rainfall seem to be usual throughout range.In Córdoba,Argentina, only occurs in wet years,sometimes in fair numbers.In Brazil,appears periodically in great numbers in some regions: e.g.Pantanal and Mato Grosso.