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Psarocolius angustifrons
This bird emits a strange sound and in doing so adopts this position.
fantastic thanks, I'll review the information you give me, is very interesting and complete Anne Marie McCaffrey.
There are 7 species of Oropendola in Peru. After looking at photos, my best guess is Russet-backed Oropendola.
I think it is an oropendola. The strange noises you describe, and the position, are typical of oropedolas. I don't know which species are native to Peru though...