Our Mommy hen was killed last night and left 3 baby chicks that are 3 1/2 weeks old. What do I need to do to take care of them? They were in a coup with 3 other hens and doing great. Temperatures get 35 to 40 at night. We didn't have a light on them at night because Mom kept them warm. Any information would be greatly appreciated since I am new to raising babies.