Nothing but rose petals.
Two days ago when I took the last photo, the babies looked like they were getting pretty close to fledging, so I imagine that's what happened. They must have been pretty close by, because the parents were still in their protective posture, squawking and warning us to stay away. I think they read yesterday's letter I wrote to them, because neither of them actually dove at my head ... and we can go in the garden without too much fear.
So I won't need to use the yellow 'Caution' tape that I bought at Lowe's yesterday to rope off the yard to warn our visitors who come to today's Open Garden. As much as I loved the humor factor of roping off part of the yard with neon yellow crime-scene-type tape, I'm glad that I don't need to worry about someone being frightened or hurt by the birds. Neither of them ever made contact with us or the cat ... but it sure looked like they wanted to.