I bet it does happen, that people just assume without checking, and toss the egg.
I did check and there was no indication of life. put it up to my ear and listened, etc.
Hatching eggs can certainly teach us about struggling for life.
I had 28 of 29 eggs hatch on day 21. Egg 29 was pipped but not making progress. I decided to give it day 22 to hatch.
I left home for a few hours and came back to an unhatched chick, with no further progress on the pipped area.
I...