We had one 6 week old chick that was extremely aggressive towards the other chicks. Jumping at them and pecking their eyes. You can see her wait until they turn or lift their heads and then she pounces on them or runs after them. She's the largest so decided to separate her and recently went back and bought a few of her siblings to keep her company (since they are her size and she knows them). She is just as mean to them. They are terrified of her. We only purchased them a week apart so you's think she would remember them, but nope. We separated them by a gate for the entire day but she found a way threw last night and went straight for them. Is there any hope for this chick? She is the sweetest thing to humans. Will spend hours sitting next to you while you work. Loves being held, just hates other chickens.