Hi, I'm new here and also a newbie at raising chickens. Any help would be appreciated. I currently only have three chickens; one black australorp and two golden sex links. All have been laying for about one year and I usually get two or three eggs a day. The australorp's eggs have always been smaller and less frequent than the other birds, although they are thick-shelled and appear healthy. Up until recently her eggs have been spotted, but the spots wash off easily. About three days ago, she started sitting on, not only her egg but, the eggs of the other chickens too. She rarely comes out of her nesting box, only just to eat and drink, then right back on the eggs. I have to take her off the eggs physically to remove the eggs daily. I don't have any roosters. Yet, she appears to be sitting on the eggs as though expecting them to hatch. Is it normal for chickens to sit on other chicken's eggs? Is it normal for them to sit on the eggs for days, even if there is no rooster around?