Well, the robins flew the coup. I noticed yesterday that mama robin wasn’t sitting on the nest. I thought maybe the eggs had hatched and she was getting worms.
This morning she was off the nest again and thought that was odd. I checked the events screen and 4 clips like this.
I checked the area beneath the nest and found shell fragments. Not sure if she was chased off by the sparrows or something else. Maybe the sparrows will take over and raise a clutch of their own.