From BBC News Online:

Next week is Mike the Headless Chicken Day, celebrating the life and prolonged death of a rooster who lost his head in September 1945, but continued running around for 18 months. His owner fed the bird through its neck, using an eyedropper. Scientists worked out that the axe had missed Mike's jugular vein and that a blood clot had prevented it bleeding to death. Most of its brain stem was left on its body, and Mike continued trying to peck and preen as if nothing had happened. The event will be commemorated in his hometown, Fruita, Colorado.