Chosen direction...

After the group critique of concepts, I came away with the most confidence in my cave dwelling bird concept.
I have done some research into the evolution of bird species into the forms they currently hold. One part of this that I intend on incorporating into my creature is a new version of the feather, extrapolated conversely to the current evolutionary direction. According to the infinite knowledge of Wikipedia,

"Feather evolution can be broken down into the following stages:

1. Single filament
2. Multiple filaments joined at their base
3. Multiple filaments joined at their base to a central filament
4. Multiple filaments along the length of a central filament
5. Multiple filaments arising from the edge of a membranous structure
6. Pennaceous feather with vane of barbs and barbules and central rachis
7. Pennaceous feather with an asymmetrical rachis
8. Undifferentiated vane with central rachis"

Due to the stationary nature of this creature, it requires no aid in air resistance. This means that over time the feathers gradually devolve until they can serve a different function to those of the creature's ancestors. In this case, that function involves ensnaring small bats and birds, so the feathers will change from the classic wing feather form, (see number 7), into a harder and more predatory form of the single filament feather, (see number 1).