Pompeii's Mystery Horse is a Donkey
(The link above is supposed to be a "permalink." We'll see about that.)
So...DNA of a supposedly extinct breed of horse thought to have been found at Pompeii...is not. Seems the lab mixed horse DNA with donkey DNA, producing the illusion of an exciting new hybrid. But it's just a donkey. There's still something interesting, if you know your donkey breeds and their history.