I put some fertile eggs under a broody hen and there are just 3 days to go for hatching. This morning she got off long enough for them to change temperature. They were not cold, but only just luke warm. The hatch had swung shut with the wind after she got off the nest and went outside, so she was not able to get back on the nest. I can't believe this has happened. The outside temp is around 7degrees above, Have they died? How much temperature change can the eggs deal with? She is back on now. She could have been off from 30min up to 2-30hrs. What do you think? Thank-you.