My neighbor got two new birds today. She just put the new birds in with the existing birds. She had one of her older chickens, the low bird in the old picking order, fly at one of the new birds with her talons out. She said that it looked like the cock fighting she has seen on TV. She put that bird is a dog crate for a few hours and then tried again. She said that older bird was trying to peck the eyes out of the new birds. She said that this bird had always been a loner, sort of away from the rest of the flock, but never aggressive before. Now my neighbor is afraid of this chicken and does not want to keep it. I have taken the chicken and put in my spare coop. My questions is, should I try and integrate this one bird with my flock or not? This chicken is around 18 weeks old from the looks of her. My flock is a mix age group. I will keep this bird in my spare coop until we decide what to do next.