The first time I saw an egg out of the nest cup and up against the front panel of the box, I thought it must have been jostled out by mistake, and I gently rolled it back into place. The second time, I began to wonder if there was something wrong with the egg and it was being rejected, but I erred on the side of caution, and replaced it into the nest. The third time, it was obvious that Mama Bluebird doesn't want this egg for some reason.
This is the first time in 15 years I have seen a bluebird reject an egg. I haven't removed it from the box, just in case, but I highly doubt it will hatch. How does she know?
These are the times I wish I had a nest cam, to watch what was going on inside the box. I imagine Mama B struggling mightily to move this object up and out of the nest. "I told you - umph, ha, oof - that I don't want - erg, hmmm, aah - this thing - huff, puff - in my - ooh, ow - nest. Now, stay out!"
On the other hand, Mrs. Tree Swallow has filled her nest with so many feathers, you can't see anything else. Just 9 days ago, I captured this image:
Today, this is my view:
Baby Tree Swallows, are you in there?