After admiring my friend's chickens, my husband and I decided to get our own backyard chickens. Due to our city's ordinance, Spokane, we'll be raising just three to four hens. My husband is busy building the coop and it's up to me to prepare their first home. I have a big sturdy box that should work for the first few weeks. What is best to put on the floor of their brooder? I've read rags, wood pellets, saw dust? They'll be in the house for a few weeks - I don't want our house to small like a barn, but I want the chicks to be comfortable. Thanks for any tips and advice!