[quote=@Orcus]
<Snipped quote by Earnest Evans>

Chris Avallone comes straight out and says that while they might exist it would be like finding a unicorn, the man with the mule does imply that they did make it through, but in probably severely diminished numbers. Probably even worse than most animals, and NV breaks lore a lot but the dead horses could of found them in picture books man. Zion is after all a preserve.  
[/quote]

What's true in the Mojave Desert, an arid California, and Washington DC is most likely not as true in a state [i][url=http://www.carolinaouterbanks.com/horses.htm]confirmed to have wild horses living in it[/url][/i], and with a somewhat-active horse-rancher industry to boot. Though I'm not sure how many wild horses live in Zhang's home of Atlanta, Georgia, it's totally justifiable for there to be horses (both wild and feral) in the post-war Carolinas.