Bird on a Window Ledge

In the front of the house we have a birch tree.  This year a robin built a nest and had a baby.  It started a few weeks ago, hopping around the front yard.  Eventually the cats - especially Princess - started hunting on the window. 

Bird is now gone, probably flew away finally.  Princess is sad....and still looking.

Keeping on the cat.  

I'm in a pissy, irritated, down mood.  I think it has to do with that issue of existing, being present in life, birth right to be here.  It just rumbles deep below.  I'm not to sure on how to heal it and feel I belong, believing I should/can exist etc.  Don't know what else to say about it.  So onward.