I have 1 of 14 chicks who knows my voice. She was always the smallest chick and so for some reason I held her most. We had a traumatic day with the murder of 2/3 of our original flock and then a brooder fire all in the same day. She is the sole survivor. So every time I go to the coop I call her and she runs to the window to watch me come. She also gets upset when I hold other chicks. She will chase every one away from me as to protect me and if I manage to pick someone else up she starts jumping at me and being very loud like she is having a tantrum