I came home from work today to find my momma hen missing. There were feathers in the pen and outside. The momma and 3 chicks were fine this morning. They are 11 days old and very healthy. See profile pic. Daytime temps are 80-85 degrees and nights are 60-65 degrees here in TN. What do I do? I am afraid to put them in my coop/run with my 13 hens since they are so young. They have been outside under our deck in a pen since hatching. They have been staying in a brood box during the nights. When can I put them with the big girls? Do they need a heat lamp? If so, how long? This is my first time with chicks. Help, please!!!