My hen Terry has recently started sitting on her nest, but yesterday at around 10 30 am she got off for the whole day, only o return early this morning ( I'm not sure what time). Yesterday it was extremely hot, a heat index of 106. This morning it's only about 78 outside. My theory is this, with the humidity so high, yesterday, it won't matter if Terry didn't sit on the eggs because they are still getting the required warmth. To back up this theory, I would like to add that the nest is built up over the eggs very well, and I assume helps to trap in a lot of heat. Anyone agree or disagree? Does circle get the square?