“I was under the impression there were no horses in the Americas prior to being imported from Europe.
Same here. Is this your typical bad reporting, or did horses inhabit North America at some time in the past?
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The horses they’re talking about are probably no bigger than dogs. They’re in the horse family but did not survive into the times humans were here. The larger riding type horse was brought by the Spanish.
Actually the last of the ancient horses that lived in north America were nearly as big as horses of today.
http://dinosaurs.about.com/od/otherprehistoriclife/a/horses.htm