I just had a problem with this also! I had three Maran chicks, I ended up with two pullets and a roo. They are about 8 weeks old now, and I have not put them in with with older ladies yet but they don't need a light anymore. A few days ago, I had checked on them, left for two hours, came back and one of the pullets was dead. No sign of illness, and no blood, but her head was wet. I was puzzled and sad. Last night, I was outside piddling around and I heard my other pullet squawking so I ran in to find a snake wrapped around her! I got it off her and before I could find something sharp enough to kill it, it got away. My poor pullet is traumatized, she has been quiet ever since. I wrapped her in a towel and carried her around with me all evening, she seemed to enjoy that and fell asleep with me. Now I'm not sure what to do, obviously this snake is coming back for more, so I can't put them back where they were!