i had one chick hatch like that it quickly died ..some dont make it .
sounds like a new one someone donated a egg to her ...sometimes a broody will kick undeveloped ones out
Ahhh, I had wondered if that could be the case... so the original went into the food clutch and a new one took it's place and started to develop... my bad. I should have removed the other right away... the original marking had faded on all of them, so I remarked them to keep track... must have just marked it wrong... it was marked with a big fat ?