It is becoming very obvious with time that we have a very small guy in the bunch. I hatched a few eggs for a friend from her Araucana (green-egg layers). The eggs were actually larger than mine.
But the one peep that successfully hatched from these jumbo eggs, though starting off the same size, is now 1/2- 1/3 the size of the others!
Upon further investigation, though his mother was clearly a normal chicken-sized Araucana (because of the large egg), the father had to have been a bantam. And sure enough there are bantam roosters running around my friend’s farm. She thought they were too small to reach for breeding but we have proved otherwise!