And then, there's this

Mike the Headless Chicken survived a beheading in 1945 in Fruita, Colo. Afterward, Mike could go through the motions of pecking for food, and when he tried to crow, a gurgle came out. His owner put feed and water directly into Mike's gullet with an eyedropper.

Scientists examined the chicken and theorized Mike had enough of a brain stem left to live headless. He was a popular attraction until he choked to death on a corn kernel.