Scientists Tested 8,500 American Wild Horses — And Their DNA Told a Completely Different Story

Scientists Tested 8,500 American Wild Horses — And Their DNA Told a Completely Different Story Everybody knows the story of the American mustang. Horses off Spanish ships five hundred years ago, slipped their ropes and went wild, and that dun coat with the black stripe down the spine is supposed to be the proof still running loose in Nevada. Then somebody actually read the blood. Over twenty years of roundups, hair and samples were quietly collected and filed away, and the archive ended up holding more than eight and a half thousand horses from two hundred and thirty five separate herds. When the DNA was finally compared against known breeds, most herds came back heavily mixed with no clean line to anywhere, and the closest matches were not Spanish at all. They looked like North American working stock. Ranch horses. Animals that slipped a fence sometime in the last hundred and fifty years. In this one I go through what that does to the legend, including the part that properly stopped me, which is that the three famous herds everyone points to as the real Spanish ones, Sulphur in Utah among them, did not group with Spanish breeds either. The herds kept their names, their mountains and even their markings while the blood underneath quietly drifted away. Real Iberian ancestry did turn up, but only in a handful of herds, and the thing they had in common was isolation, which is also the thing slowly narrowing them. And then there is the bit that reframes all of it. The horse family spent most of its fifty million year history in North America and spread out from here to the rest of the world, then vanished from this continent for about ten thousand years. So the Spanish did not introduce a stranger. They returned an absence. Meanwhile the helicopters are flying again in Nevada this autumn, and every horse loaded into a trailer is another edit to a story nobody ever wrote down.