Last night I was watching 'The Natural History Of The Chicken' on PBS , and they showed all about hens laying eggs, and how chickens and roosters get their necks cut off to put food on the table, and run around until they die. Well with a lil' google search I found the one that they were talking about that DID NOT DIE after getting its head cut off!! It just stood there, this doesnt go into details, but they said the farmer back in 1946 tha cut the head off, said that he entered it in side shows and things... This is freaky!!!.........
Eventually he died from suffacation in the airway. I wonder how and what kept him alive!? They even mentioned he tried to CROW, but it was like garbbled. Now I know why vegitarians are vegitarians!
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well...hens are known to have a rather small brain....though it seems that however small it is, it doesn't even cover the motion controll impulses.(..j/k..course it does) Don't know why that hen lived..or how did it breathe untill it suffocated.
The running round, or standing still, has something to do with residual nerve impulses left in the body after the head's been cut off, which is why the movements tend to be rather uncoordinated.
As to the long term survival of a headless chicken could be because the heart isn't controlled by the brain and so long as some sort of oxygen supply can be maintained it will continue to beat and therefore keep the body alive.
I read somewhere that when the farmer cut the chicken's head off, it still had a small section of the brain stem left. Just enough to do some small, primitive thinking, such as: eat, breathe, walk, crow.