I'm looking in increase my flock this year. I currently have 5 Americanas and 3 Buff Orpingtons. I thought that I would like to try some Bantams, but have 2 questions. First, will the regular sized ladies pick on the smaller ones due to their size and if I get Bantams where the regular sized breed is very cold hardy, will the Bantam be cold hardy too? I am thinking about Partridge Wyandottes and Bantam Americanas. Thanks!