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This Is How Horses Turned Their Toes Into Hooves

New research helps to explain how horses evolved to become the only living animals with just one toe per limb.

Artist’s reconstruction of Hyracotherium at the Carnegie Museum of Natural History. Photo by James St. John
Illustration showing the evolution of digital reduction in the forelimb of horses. | McHorse et al., adapted from an illustration created in 1925 by W.D. Matthew.