I have a coop with an attatched covered run that has sand put down in it, and then they also have a free range area during the day where they can peck at the grass and the earth and what not. I thought the same thing.... they needed more than just sand...... but the sand is great for the indoor run which gets more use and would be smellier without the sand. And I use construction type sand with the small rocks and what not in it
