Perhaps it was juvenile because it was a relatively small bird. I agree that your suggestion makes most sense. I recall our guide saying it had a distinctive call and the Montezuma Oropendola sounds like what she described. Thanks for the id! http://sounds.bl.uk/Environment/Listen-to-Nature/022M-LISTNAT00299-0001V0
Are you sure you saw this as a "small" bird? Or was is a juvenile? It is quite large. The tail is obviously yellow. There is only one candidate for such kind of bird: Psaroclius montezuma.
https://en.wikipedia.org/wiki/Montezuma_Oropendola
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