My guineas have a "common" nest, all the hens seem to share one nest. At least that's the only one I know of. It has over 20 eggs in it. For the last two nights one of the hens sat on the nest all night long, but then gets up during the day to free range with the rest of them. Is this normal guinea behavior? Will she start nesting all the time soon? I'm worried that staying on the eggs at night warms them up but during the day when she's gone they get cold. Will they ruin this way? This is my first time raising guineas.