Today there is plenty of sunshine. I was able to capture very clearly both Bluebird parents doing their chores.
Following that both parents fed their babies and checked, but no fecal sac was retrieved. They flew away to look for more food.
One more trip for Bluebird father. Maybe Father’s Day is not celebrated in the realm of birds.
Incidentally, once they fledge, young Bluebirds will not produce fecal sacs.