I got 2 chicks that were Kgarten hatching project. They have been inseparable since I got them, if one goes out of sight of the other, the other immediatly began crying. One of the chickens has been a little more agressive than the other the entire time..not much but a lil. Well the calmer one all of a sudden is attacking the other. Any time she gets anywhere near her, she pecks her in the head, tries to climb on her.... lots of chicken shrieking going on. I opened the pen and the lil victim ran away to the other side of the yard..she followed and won't let her alone, keeps pecking at her. I picked up the attacker and she was calm and didn't mind. As soon as I set her down she ran to go after the other one again! Hubby finished their coop today so they were going to spend their first night outside, but now I am afraid to lock them up together!