In the 1880's, a mysterious beast called the "Red Ghost" terrorized the people of Arizona. Local legends claim he was a giant red horse, thirty feet tall, with a sun-bleached skeleton riding in his back. Stories of the Red Ghost spread all over Arizona, until one day in 1893 when a local rancher shot and killed the Red Ghost, only to discover he was actually a camel. The pale rider was a human skeleton that had been tied to the camel's back.
Nobody knows how the dead man ended-up tied to a camel's back, but we do have a good idea of how a camel ended up in Arizona in the first place.