I live in the city and have six chickens. Four different breeds that started laying eggs August 1, 2013. This is our first winter and we have both a timer for light and heat lamp. I average five eggs a day, but two days ago my White and smallest breed Ornamental Bantam has been sitting on the eggs in the nesting box. I read that this behavior can be associated with being broddy. I am not aware that I have a roster in my group, so is this normal or should I be looking for something more. I have not touched the eggs she is sitting on, but I have brought her food which she accepted and scarfed down. Any suggestions on what I need to do next or what I should be looking for?