Ok so I'm probably going to be getting some baby chicks pretty soon. From what I am told they are about 2 weeks old. I am wondering if I can raise them outside (in a secure shelter) without a heat lamp. It's been consistently in the 80's and 90's during the day and drops down to about the low 70's at night. Would the chicks be too cold or too hot? Also, when would be a good age to start letting them out to forage? My goal is to allow them to forage more most of, if not all of their food when they're old enough to free range.