Thoatherium
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Extinct (fossil)
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Thoatherium is an extinct genus of litoptern mammal.
With a length of 70 cm (2 ft 4 in), the gazelle-like Thoatherium was the smallest representative of the order Litopterna. Judging from its long legs, it was a fast runner. Thoatherium had remarkably reduced toes; only one horse-like hoof remained. Thoatherium even lacked splint bones, which are remnants of the second and fourth toe which are even found in modern horses. Judging from its teeth, Thoatherium fed on leaves.