Ladies and gentlemen, the zombie sideshow attraction Mike the Headless Chicken:
On Monday, September 10, 1945, farmer Lloyd Olsen of Fruita, Colorado, had his mother-in-law around for supper and was sent out to the yard by his wife to bring back a chicken. Olsen failed to completely decapitate the five-and-a-half month old bird named Mike. The axe missed the jugular vein, leaving one ear and most of the brain stem intact.
On the first night after the decapitation Mike slept with his decapitated head under his wing.
Despite Olsen's botched handiwork, Mike was still able to balance on a perch and walk clumsily; he even attempted to preen and crow, although he could do neither. After the bird did not die, a surprised Mr. Olsen decided to continue to care permanently for Mike, feeding him a mixture of milk and water via an eyedropper; he was also fed small grains of corn. Mike occasionally choked on his own mucus, which the Olsen family would clear using a syringe.
When used to his new and unusual center of mass Mike could easily get himself to the highest perches without falling. His crowing, though, was less impressive and consisted of a gurgling sound made in his throat, leaving him unable to crow at dawn. Mike also spent his time preening and attempting to peck for food with his neck.
Read the rest at Mike's Wikipedia entry.
As a bonus, another zombie bird...not sure of the exact origin of this series of photos, but holy shit: