Shelia,
As far as I know the cats don't lay in wait there. Maybe because I'm outside so much. The robins use it before they use any other, so I leave it.
Sheryl,
We get the sparrow hawks sometimes, but not very often.
Speaking of robins. I started out making a small round butterfly bed. Yes, ahem, that's what DH thought anyway :o) It progressed like they all do.