I currently have two two year old roos and two hens that someone gave me two weeks ago (my first chickens). This spring, I would like to add ten pullets. I have a 10 x 10 shed that I use for the coop and a large run (which they haven't used yet due to weather). I have read quite a bit on this site about separating new additions for a week or two before giving them access to one another. My problem is that I cannot do this as they cannot be separated in the coop. What will happen if I just add the pullets at night to the coop? This is my preference, but I don't want to wake up the next morning to a bunch of dead chickens (or is this even a possibility?). I understand the risk of disease (by not incubating them) to my current chickens, but I am willing to take that risk since it is such a small flock and they are older. I really don't want to cull my current four birds to bring in the new ones as they are all nice birds. Thoughts?