Also known as Miracle Mike, Mike the Headless Chicken was a plump, five-year-old cockerel when he was unceremoniously beheaded on 10 September 1945. Farmer Lloyd Olsen of Fruita in Colorado did the deed because his wife Clara was having her mother over for dinner that night, and Olsen knew she'd always enjoyed a bit of roast chicken neck. With that in mind, Olsen tried to save most of Mike's neck as he lopped his head off, but in doing so, he accidentally made his axe miss Mike’s jugular vein, plus one ear and most of his brain stem, and to his surprise, Mike didn’t die. In fact, Mike stuck around for a good 18 months without his head.

Mike’s unlikely survival has everything to do with how his skeleton was shaped, Wayne J. Kuenzel, a poultry physiologist and neurobiologist at the University of Arkansas, told Rebecca Katzman at Modern Farmer. Because a chicken’s skull includes two huge holes for holding its eyes in place, its brain fits snuggly into the remaining space at a 45-degree angle.

More Info: blogs.scientificamerican.com