Just a quick update.
I went to Petco & picked up some stuff that you can put in your yard that supposed to keep cats away. I'll see how it works. It's a powder that comes in a paper milk carton. It was the only thing they had that didn't need to be applied every 24-48 hours.
Still, at 13 bucks a carton (it should last a few months, at least during winter; it needs to be re-applied after it rains), this is an expensive option I shouldn't have to resort too. Plus, I have no idea what the product will do to our grass/flowers over time.
As the cat is Black & we've re-arranged our deck furniture to take away its prime hiding spot, I figure the birds'll be OK for the winter. Kinda hard for him to sneak up over a blanket of snow. I'm going to take pictures of any kitty tracks in the snow, as well as any photos I can get of that cat in our yard/stalking the birds/ pooing in the yard. That way, if I do have to resort to Animal Control, I'll have photo proof its doing what I'm saying its doing (eliminating any he said/she said with AC).
Come spring, I'll have to do something one way or the other. The cat'll eventually get smashed flat living next to our busy road, but who knows how long that will take. She lives in an old-rental place, it's got orginal single-pane windows & poor insulation, She might be forced out by utility bills this winter (she has yet to begin to winterize the place). Still this gives me some time to come up with other options. I don't really want the cat dead & I don't want to tick off this lady, but, at present if she won't try to deal with HER cat, I'll HAVE too.