Just went outside to candle the eggs under our broody hen. The eggs were under her... but cold to touch. My son said he had seen her off the nest for a bit, and it's 29 degrees out there. Oh dear. Candled them anyway. The babies were moving around inside two of them. The other (which was undersized and very porous, so not expected to hatch anyway) had died. Anyway, it's a lesson to me in just how resilient the babies can be--to be that cold to touch and still squirming in there. Mama is back on the nest and they're probably warm again by now. She's a silkie, and her mama was an amazing brooder, so I'm assuming she knows what she's doing.