Another nesting Black Swift, a report by Craig Bennett
Thank you all for your research and ideas regarding the Cypseloides Swift photo. It appears that the concensus so far is Black Swift.
In the category of more data is better, I attach a new photo I took a couple days ago at a waterfall I hadn't visited before. It appears to be the same species with the pattern of white markings on the face the same as the previous photo.
The search continues - I'll keep you posted.
This would be the second breeding record in Panama of this rare, but apparently overlooked, species. The first breeding record from Costa Rica is pretty recent, so if I were you I'd be peeking behind every waterfall I run into.