Question: What is the origin of the modern horse in the New World?

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Question: What is the origin of the modern horse in the New World?

Most scientists believe that the horse originated in the Americas and spread across land bridges from the Americas to Asia, eventually migrating into Africa and Europe. Over the course of millions of years the horse evolved from a smaller breed to the larger horses of today. Near the end of the Pleistocene period--about 10,000 years ago--the most recent ice-age came to an end. During this time many large mammals that once roamed the Americas became extinct. Among these were mammoths, camels, and the mid-sized horses that once lived in abundance in the New World. Scientists typically postulate that these animals died off due to climate changes and possible over-hunting. In other parts of the world, however, horses continued to thrive and eventually evolved into modern-day horses. When the Spaniards came to the New World in the early sixteenth century, they brought horses with them. Some horses eventually escaped and multiplied in the wild.

A horse skeleton from the La Brea Tarpits, in Los Angeles, California. The Museum notes that this is an example of the "extinct Western horse". Image taken from [1] on the La Brea Tarpits Museum website.