Horse subspecies

thumb|External anatomy of a horse|upright=1.5|alt=Diagram of a horse with some parts labeled.

subspecies of mammal

The tarpan (Equus ferus ferus) was a free-ranging horse population of the Eurasian steppe from the 18th to the 20th century. What qualifies as a tarpan is subject to debate; whether tarpans were genuine wild horses, feral domesticated horses, or hybrids is unclear, though DNA sequencing suggests that at least some tarpans were genetically distinct from modern domestic horses. The last individual believed to be a tarpan died in captivity in the Russian Empire in 1909.

derivation of horses from an ungulate precursor

subspecies of mammal