Susie, the birdhouses are so beautiful... and I'm right there with you as far as the cats, I have 2 and love them immensely, but also love the birds, and sometimes that gets to be a bit of a conflict.
Every day I tell them I'd better not be finding any red feathers (from the cardinals) lying around the yard
On the other hand, a couple of years ago my older cat, Kinja, got pretty badly beaten up by a bluejay... took her quite a while before she would even go outside again.
Sometimes you're the windshield, sometimes you're the bug...