One of our chick brooders on top, gosling brooder (at least presently) on bottom. I like being able to see the easily (helpful in checking often for pasty butt), BUT we will probably modify slightly. We used hardware cloth and it goes all the way down to he brooder floor. Now that they are bigger, we're having an awful time of them kicking all the hay out... I'm thinking we'll add some additional trim pieces around the bottom to contain all (or at least more) of the hay. We're also going to put the larger one (currently occupied by goslings) on some castors. That sucker is HEAVY and gets a little hard to man-handle outside for thorough clean out.