I’ll admit I was crushed when Nathan wrote a feature for xeno-canto before I did. I have no one to blame but myself; it was pure laziness on my part that kept me from doing one. After I got over the bruised ego from him being first I got my act in gear and wrote one of my own. So if you want to read about the vocal variation in Band-winged Nightjars, check out my first xeno-canto feature.
Like Flycatchers and other suboscine passerines, Nightjars don’t learn their voices. So distinct vocal variations may well have taxonomic implications. In Band-winged Nightjar in particular there seems to be a good case for further study, and potentially splitting the species. For example, note how the differences in Whip-poor-will vocalizations recently played a role in the split of that species.
Finally, if any of you have recordings of Band-winged Nightjars you could upload to XC, especially of the decussatus, roraimae, or patagonicus subspecies that would be of great help!