Setting eggs at different times can cause a staggered hatch, which yes, can require you to intervene as usually momma will wait for about 2 days and then abandon those that have not hatched to care for the little peeps about her feet. This natural 1 to 2 day delay time happens even with eggs set at the same time as chicks can develop and hatch at slightly different rates, especially an egg that was at the edge of warmth. Hopefully the extra egg was laid (or stole) the next day so that there isn't much development delay and it all just works out. Some hens are better than others in handling a staggered hatch; most of us prefer to avoid that situation as it really taxes the hen and can cause loss of chicks either as momma sits and sits on eggs ignoring the older chicks or gets up with the older chicks and abandons the eggs.Just to update... I don't know what's going on underneath her and it's driving me crazy. The suspense! I hear all kinds of cheeping and eggs clanking together. They or it must be moving because Sparrow will readjust herself. I have a feeling it's going to hatch while I'm in bed. And then it's so cold it might be a couple of days before I get to see anything. The only problem is I can't remember how many eggs I put under her originally (I know this is horrible, I should of wrote it down). I thought I only put 1 of her eggs and 1 large egg, but there are 2 of her eggs. So if she added one to the clutch later on...I will have to pull it and put it in the incubator if she leaves the nest, right?
Shrink wrapped is a term referring to the thickening of the inside membrane such that a chick gets stuck in it like being "shrink wrapped." Low humidity in the incubator, or a sudden lessening of humidity (as can happen when we peek at the wrong moment) can cause the membrane to dry out thereby causing the hatching chick to get stuck in the membrane. A chick will first pip (poke a hole in the membrane and the outer shell), then begin zipping and chipping away the outer shell. The membrane should be soft and pliable and either tear or come away with the outer shell, if it doesn't, it can stick to the chick making it very hard for the chick to get through.
Lady of McCamley
EDITED TO ADD: I had a shrink wrap situation with my Buckeye project (see photos below). One chick had fallen out and gotten chilled, in my attempt to rescue that chick, I disturbed momma at a most crucial moment (she literally screamed at me in panic to get back to the chick as I had lifted her off to reach the chilled chick). The partially hatched chick was in the partial shell with membrane covering it, tiny hole picked. I watched over the day, but the chick did not progress with hatching, though so close. By the end of the day, I knew I had caused a shrink wrapped situation and looked up the "assisted hatch" info here on BYC and assisted that chick. It was touch and go for several days as bacteria had gotten into the chick with the open shell for such a long time (squishy tummy at umbilical site), but with TLC and several weeks of antibiotics that chick is now a lovely Buckeye hen.
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