21. Lions

Dorothy was right to be afraid of lions, because many are not cowardly at all. Lions kill around 70 to 100 people each year, some of whom they eat. Whenever a big cat gets a taste for human flesh and actively hunts people, they’re called a man-eater. This isn’t normal behavior, but there are a few possible explanations. 

For example, in 1898 there were a pair of lions that killed between 35 and 135 railroad workers in Kenya. The two were shot and killed, but when scientists inspected their skulls decades later, they found a compelling reason for why the lions turned man-eater. Their teeth and jaws were damaged, likely keeping them from hunting their normal prey.