Updated:The walking dead have decided to pedal bicycles in sunny Florida. Thousands of blood-hungry zombies jumped on their bikes and took to US-1 along the Atlantic Ocean through Key West. Some brought body parts along for the ride. It's the fourth annual Zombie Bike Ride. Since 2009, the ride has grown from a couple hundred participants to more than 7500. Within the crowd, standout characters included "Uncle Sam" with a broken heart.