Discovered the shell in the mulch. Thought a predator got to the eggs. Went to check on the next and then grabbed the camera. I feel so fortunate to be able to experience this little miracle. Hopefully, the other 3 eggs will hatch. Oh, I forgot, I found another robin egg after a big storm swept through. It was unharmed/uncracked, so I placed in the nest and Momma Robin adopted it.