There are 21 chicks. The brooder is 5x5' with cardboard walls approx 3' tall. Five of them were loose in the room when I went in with the evening meal. And just to ice this cake thoroughly, a sixth chick flew up and over the brooder wall as I approached! Three walls are framed and raised on my coop...please, please let the rain hold off tomorrow... On the other hand, my favorite chick, Einstein (she's smart, outgoing, and just cannot seem to get rid of the last of her grey head fluff), decided that after she had filled her crop that she needed some lap time. Made happy chick noises while I petted her, then started settling down to sleep. Heart melted.