Feathered Friends- Unusual Bird's Nest and Feather

Hi everyone! I was at the park and saw this bird's nest in the overhang for the picnic table. I have never seen a nest like this one before so that is why I say that it is unusual. I didn't see any birds flying around to give me a clue as to what bird made this nest. Maybe our bird expert Hive account@melinda010100 knows.

I don't know if this feather belongs to the bird on the branch. I will show my appreciation (hint, hint) if you can solve these two mysteries for me.