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Myiozetetes similis
Sorry, based on these pictures I cannot confirm any of the candidates for sure.
I uploaded another shot...there were several of them in the trees and on the ground.
Any other picture? Looks like being the Great Kiskadee, Pitangus sulphuratus, but I would need a closer view of the head to confirm.
https://en.wikipedia.org/wiki/Great_kisk...