Ok, I don't think they can reason, but I do think that they learn t know what scares them, and will avoid situations that caused them to be scared. That being said, we have all heard about a roo or a hen that just wouldn't get it, so there are always exceptions, but in my case, I have an aggressive hen that I smack upside her head, and she seems to get it - for a while. She is still young - 14 weeks, so we will see. Her name is Hannibal. HAHAHA!