A Horse is Four Years Old when it…

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Two Nokota horses standing in open grassland with rolling hills and trees visible in the background.

A Horse is Four Years Old when it changes from a filly to a mare. The horse (Equus ferus caballus) is one of two extant subspecies of Equus ferus. It is an odd-toed ungulate mammal belonging to the taxonomic family Equidae. The horse has evolved over the past 45 to 55 million years from a small multi-toed creature, Hyracotherium, into the large, single-toed animal of today. Sources:

Wikipedia & Scholars

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