We are totally new to backyard chickens... Bought my three daughters 6 hens in early May - one recently got sick and passed - we introduced a new young hen we bought at a poultry swap(bantam) and the larger hens have been 'attacking' it. Pecking at it's head and jumping on it!! We have NO rooster. The people I've talked to who I know have hens have never heard of this - has anyone else?? Our other breeds are Light Brahma and Rhode Island Red - Thanks! This is scaring my daughters - the original chickens have never shown any agression towards each other or any people. Right now we're separating them, but the bantam is freaking out!