Now this may sound like a stupid question but, does a chicken start sitting on the first egg, or do they do like ducks and start sitting after they have a nice nest full of eggs? I have a hen that flies out of the coop every day, for the last few days she has been going into my rabbit barn, in a little nest she made in the hay and lays her egg, once the egg is laid she leaves it. I have been taking the egg each day, but I am wondering since she is so determined to lay them in that spot if I leave them if she might decide to sit on them? Just wasn't sure if they wait to have a nest full or if they start sitting with the first egg? Thanks for any help!!