Matthew Murphy commented on an older version of Iraúna-de-bico-branco (Cacicus solitarius) - Ninho:
Although the shape and construction of the nest is appropriate for this species, the fact that there are no obvious standards for length, coupled with the absence of (1) other nests [this species is colonial] and (2) the photo is cut off before it becomes clear whether the nest is attached to the tip of a branch, as is the manner for this species of cacique, I must tentatively assign this photograph an "untrusted" rating.
Although the species in question (Cacicus haemorrhus) is nowhere to be seen, several factors point these nests' owners being correctly identified. According to Jaramillo and Burke (1999), red-rumped caciques are colonial, prefer to nest in palms, and are found in Iguaçu National Park.
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