At first, they were silent, and the parents came and went less frequently. On about day four, I could hear faint chirpy murmurings from inside the nest if I put my ear to it, but could hear nothing from a short distance. Both parents took turns entering and leaving the house with morsels. In thirty minutes they could be observed coming and going two or three times.
Now, on day 10, it's a constant parade of Madame and Sir taking turns bringing food to the door. The nestlings must be much taller and more aggressive by now, because the parents no longer enter the house to feed them. They only perch on the doorway, hand off their offerings, then fly off to find more. The nestlings make such a clamor when either of their parents arrive at their doorway, I can hear them from the swing---even from the house, if the windows are open---my house, not theirs---which is maybe 50 yards away.
Thankfully, I'm not responsible for feeding these babies. They are running their faithful parents ragged. Occasionally I see Sir carry off a white vitamin shaped capsule, which I think is a fecal sac. Cleaning the bathroom. I remember watching Father Housewren do the same another year. Even saw him swallow it once. Probably quite nutritious. I can see why they might have to eat the fecal sacs. They have no time to find food for themselves, so busy are they kept feeding their demanding brood. dkm
Will try to get a picture of the nestlings for next post---just one peek. Must get it before Day 13, says the North American Bluebird Society. Here's what else NABS says about monitoring bluebird nest boxes, if you're interested, but I can assure you, I'll not be handling the chicks:
WHY MONITOR YOUR NEST BOX?