We have chicks in our incubator that are starting to hatch. A couple have a little protrusion that looks a little bloody on their rear end. One that is not doing so well also has a little green stuff around the rear along with the bloody spot. The shell it hatched out of also had pieces of green goo in it and none of the other ones had this. Could this be poop, or what is it? If it hadn't abosorbed it's yolk sac, what would that look like? This one doesn't seem to be as energetic as the other ones and not moving around as much. Is it normal for some to have a bloody rear? Any adice or help would be greatly aprreciated...Thanks!