My SLW and Australorpe are about 6 months old, my other girls are about 2 months older (just starting to lay). The young'uns won't roost! I've caught them recently sleeping in one of the nesting boxes (squished in together). Is this normal? They were introduced to the flock late and were a fair bit smaller, they were pecked and chased a little by the big girls. They all get along pretty well now, but the 'little ones' tend to stay pretty close to each other.