I've noticed that spontaneously or nearly so one chicken or another will start to do things that are intended to clearly send me a message to do something for them. The easiest example is about food. They have associated me with food of course, but what's interesting is what they do if I don't quickly feed them, and instead take some time to make sure everything is ok with them and in their hutch. What I've noticed when I do take longer to do this is they start to do a very specific thing. A hen will stop the clucking for a second to get my attention (there are only two so it's easy to notice when one shuts up) then when she see me look directly at her, she will peck the food tray one time, it's always one time, and then look back up at me to see if I respond. If I just keep looking, she'll do it again, sometimes a little louder as if to add emphasis (i'm not making this up). Of course, I figured this out a while ago that this is her way of saying either we are hungry or we are tired of the food we have give us something new. Once I'm done making sure things are ok, I'll go get them something, and they stop paying attention to me to eat whatever. I found this to be rather interesting, because it is clearly an association the chicken made itself. I never trained the chicken to do anything. While it seems common sense to us to associate the tray with food, what is truly a stretch in terms of animal intelligence is that the bird does too, and has used that ability to fashion a behavior to communicate with me. If I'm not mistaken that is a clear sign of abstract thinking only seen in very intelligent creatures. Until recently it was considered the type of thinking that made humans unique. Today we know that certain very intelligent crows show signs of this sort of thinking as well as Chimps, but I haven't heard of anyone noticing such behavior in chickens. This is only one example. There are a couple of more things my rooster will do that are along the same lines. The odd thing is they only do these things when the roosters and the hens are separated. When I keep them together neither the rooster nor the hens do these little things. So has anyone else noticed their chickens tailoring simple, but specific behaviors in order to send a message to us we can understand.