So I put babies out in the yard in small tractors/cages. One of my hens has been escaping her pen every morning, then frantically trying to get back in. Today, instead of frantically trying to get back into her own pen, she frantically wanted to be with those babies. Mind you she did not hatch them, and has not been broody. But now she is in with the oldest group--we will see how that goes. I'd like to have them out in the yard, but without heat, it is too cold for them at night IMO. If she will broody them, that would be great--just not sure if she is large enough--she is a little crossbreed, and these 8 are my oldest chicks, so that makes them about 7 or 8 weeks old.