Equus lenensis

Equus lenensis, the Lena horse, is an extinct species of horse from the Late Pleistocene and Holocene of Siberia, Some sources have considered it a subspecies of the wild horse. Genetic studies show that E. lenensis does not descend from the last common ancestor of living horses, and is estimated to have diverged from them approximately 115,000 years ago, though it is more closely related to modern horses than either are to a highly divergent horse lineage from the Late Pleistocene of the Iberian Peninsula. The youngest remains of the species date to 5,000 years Before Present (~3000 BC).

A notable Lena horse specimen was found in Batagaika crater in Russia which was preserved almost completely intact, and with liquid blood within its preserved veins.