Horses: Today's Arabian-type horse arose from an extinct species that we never knew - and two others that left ghostly signals in their DNA. Andy Barron,AP

Giant Genetic Study Detects ‘Ghost’ Species in Today’s Horses

Horses have only been bred for speed in the last few centuries, says the study – and the passion for breeding thoroughbreds is diminishing resistance to disease

Only two horse species exist today: the one you know and Przewalski s wild horse. A giant study shows that the horse you know originated mainly from an extinct species that mixed eons ago with two other...

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