A crude sketch I did back in, I think 2018, of some sort of aquatic metamorph bird that fed like a vampire shrimp, using long arms with brush-like filaments to catch plankton and stray organic particles in the water column.
The idea did eventually get used as the "fanfingers" in the "Ocean Age Avimanders" entry all the way into 2022. The idea definitely sat on the shelf for a very long time...