Tragedies?

Every day I've been peeking out the bedroom window to track the progress of the catbird nest. Mrs. C is usually sitting on it quietly, only occasionally taking a break. But yesterday morning when I peeked out, I found it obviously assaulted. The next is askew and only three eggs are left, with the mama nowhere to be seen. I'm holding out hope that the catbirds will rally, but it's looking grim. I blame the neighbor's many cats, one of whom was headed this way when I left for work the other day.

Here's a picture through the window screen: