I've been keeping them in the house. I started with a very large plastic storage box, I have 8 ducklings. That was fine for the first few days but soon became too much of a hassle to clean. Was using puppy pee pads as bedding. So I then switched to a guinea pig corral and laying the pee pads down in the middle of the circle. This gave them more room to run but within a few more days the larger of the ducklings learned to jump over. So now I'm using a small kiddy pool with plastic sheeting on bottom, then pee pads, then grass straw. As it gets wet and soiled I lay more grass down. After 2 days of this I thought it was time to change it all out and I could not believe the amount of liquid that was in there. Yuck! I can't wait for it to get warmer here so I can put them in the garage. I have 2 large dog crates that I will probably use. Then when they get big enough, out to the duck coop/pen they go.