We have 25 2 1/2 week olds that have plenty of space and a dowel to roost on. They sometimes seem bored, and occasionally get in to scuffles, no pecking though. Sometimes they seemed to take it out on the thermometer. The wife found a couple of ping-pong balls, one green, and one orange. They were some sales gimic for something we didn't buy. They have a bean or a BB in them and they rattle a little bit. We threw them in the brooder and were supprised to see the chicks pecking and knocking them about like beach balls.