When a bunch of Montezuma Oropendolas get together (which is pretty much all the time), you'll hear this typical chatter (recorded at La Selva (Costa Rica), 6/19/99).
In this example a male at La Selva (Costa Rica, 6/19/99) had been posturing, bill skyward, for a while with no challengers. Then this strange sound came from near him, and he answered with his regular call.
