All my young life. They have very marginal responses to their environment. They see a threat, they respond. They turn their backs on the threat, seconds later they are back to pecking at the dirt.
I spent a lot of time with chickens when I was a kid. The ones I dealt with had quite distinct personalities, some were friendly, some fearful, some brave and they also seemed to respond to stress. Obviously they are different from humans but I thought they had quite a range of behaviors.
