Neb, a rare white tiger, has died at the Gladys Porter Zoo in Brownsville, officials announced Monday. “It is with heavy hearts that we announce the passing of Neb, our 17-year-old white tiger who ...

White tigers are endangered in the sense that the animal exists because of a rare genetic mutation, according to the IFAW. There's a one in 10,000 chance a tiger can be a genetic tiger.