My chicks are about three weeks old, I'd like to move them out of their brooder and into either the kitchen or bathtub. If I put them in either place, are they smart enough to get under the heat lamp if they get cold AND do I need to put the bedding down for them? We have one bathtub, so they'll be sharing with us - I'd like to not have bedding in there that I have to empty and replace every night at family bath time. The kitchen is preferred as it's bigger and allows them more run around room, but I'm concerned they won't figure out where to go when they get cold. Thanks.