Weird！But Interesting！ Bird of Prey Bike This insane bike was invented by John Aldridge who wanted to create a safe and fast bike that wouldn't put any pressure on the rider's spine. The Bird of Prey Bike sees the rider lying almost face down. Despite the weird riding position, the Bird of Prey bike can achieve astonishing speeds. You use a pretty regular pedaling motion to propel yourself forward but have a low center of mass so risk of a major fall is low. While it looks pretty scary, the bike has proved popular with people who have spine problems.