Recently, Jason T. Weir (University of Toronto Scarborough) and colleagues published a paper on the role of rivers in the origin of Amazonian bird species. In this paper, they also present genetic evidence (based on thousands of SNPs) for hybridization between seven bird species pairs at Amazonian headwaters. The hybridizing species belong to three different passerine families: Furnariidae (Ovenbirds), Pipridae (Manakins) and Thamnophilidae (Antbirds). Consequently, these pages have been updated!
Snow-capped Manakin (Lepidothrix nattereri)
References
Weir, J. T., Faccio, M. S., Pulido-Santacruz, P., Barrera-Guzman, A. O. & Aleixo, A. (2015). Hybridization in headwater regions, and the role of rivers as drivers of speciation in Amazonian birds. Evolution 69, 1823-1834.
Avian Hybrids 
[…] seven bird species pairs that meet at Amazonian headwaters (see a short blog post about it here). They clearly showed that these species pairs are hybridizing, but what prevents these pairs from […]