The chicken was valued at $10,000 at that time. At the peak, the chicken earned $ 4500 per month.
Post Mortem story:
It was determined that the axe had missed the carotid artery and a clot had prevented Mike from bleeding to death. Although most of his head was severed, most of his brain stem and one ear were left on his body. Since basic functions (breathing, heart-rate, etc.) as well as most of a chicken's reflex actions are controlled by the brain stem, Mike was able to remain quite healthy. This is a good example of central motor generators enabling basic homeostatic functions to be carried out in the absence of the cerebral cortex. http://en.wikipedia.org/wiki/Mike_the_Headless_Chicken
like the headless chicken or like a headless chicken with its head cut off (America):
if you do something like a headless chicken, you do it very quickly and without thinking carefully about what you are doing (usually in continuous tenses)
I've got so much work to do - I've been running around like a headless chicken all week. He was racing around like a chicken with its head cut off trying to do the work of two people.
Reference and More: