Aw that's so cute... I wish I could leave the brooder open all the time, but I don't trust my cat, he's always trying to make his way in there while I'm feeding them/changing their water, and although they have pecked him on the face (LOL) I'm sure they'd all be dead despite being 6 weeks old in 10 seconds.
Yes, I have 6 week old chicks in my brooder (n) still working on that blasted coop.