at this point, one of the three that look like the one in photo #3 is a lot smaller than the others. it is growing, just slower. it seems strong (they have all started trying to fly out of the brooder) and is eating like the rest, just is smaller. it is the smaller than even the Polish. the next smallest is actually the whitish one with grey on it's wings. at this point i'm assuming breed related sizing, as they all look and act healthy.