Well we get Pelicans flying around our city and I would imagine that any hit from one of them could be a bit visually dangerous for an Aircraft.
Yeah probably only for VFR aircraft.
There is a video by mentour pilot which is really nice where he talked about a 747 that flew through volcanic ash. Part of their problems was that their windshields got absolutely destroyed and you couldn’t see through them anymore. So they had to land using IFR instruments