New Robins.
I worried I'd drop my iPod Touch on the little buggers as I held the device over the top of the fence and snapped the picture blind. But just one since the mother Robin was perched (I assume) nervously a few feet away.
Funny, when Lamb and I were rebuilding the rock garden, I noticed a Robin that appeared to be trying to draw me away from near the nest. But I didn't see the nest so assumed I was wrong about the behavior.
Then Sunday I heard the young birds chirping away and noticed them on the top of a fence post next door to me!