Firstly, Montanabw, there is no such thing as Equus caballus. That is a domesticated animal. The proper name is Equus ferus caballus - unless domesticated Horses somehow come from Zebras or Asses... Also, there is no consensus that Equus ferus ever set foot on the North American continent, though I personally believe Equus lambei may be a subspecy of Equus ferus. Thirdly, and most importantly, and I hope EVERYONE is listening here when I say this, Equus ferus caballus, the domesticated Horse IS NO MORE native to the North American west than Chihuahuas are to the Canadian tundra. Domestic forms are native NOWHERE. Period. The domestic Horse is RADICALLY different from it's wild ancestor. And Dysmorodrepanis, the reason all the Equine articles are so Horse-centric is because a very large number of vociferous (and outright foolish) people are unhealthily obsessed with horses. Unfortunately, many of these people also think themselves expert enough to declare a domestic animal native to a continent it never inhabited simply because they like to watch them run. Seriously, that's all it is. They like looking at them. It's certainly not an environmental issue. Horses are wildly destructive to their surroundings. They eat more than cattle! And an obscene amount more than the native Pronghorn (which, by the way doesn't trample its food to death like the Mustangs do with they're enormous, heavy-stepping hooves). The only argument the Mustang and Burro worshippers have to use (and they milk it good, let me tell ya) is the similarity of Equus lambei to Equus ferus. But, Equus lambei has not been proven to be synonymous with Equus ferus (though it is a possibility), and even if it were it would be more closely related, by far, to Przewalski's Horse than to Mustangs! E. lambei was tiny! It was like four feet tall at the shoulders! And all the other North American Equids are pretty well-known to not be synonyms with Equus ferus (including E. caballus). Not by a long shot. This is why the Horse Evolution page (and every other page dealing with equines) has been changed back and forth so many times. The people who know what the heck they're talking about try to add useful information and correct blatant lies or grievous mistakes and the people who like pretty ponies go back and try to convince the world that Spanish horses have roamed every continent including Antarctica, Mars and the Sun since before Dinosaurs walked on two feet. I made the ridiculous mistake of trying to add factual information to the Mustang article and, if I remember correctly, it was changed WITHIN THE HOUR. The person doing the changing even removed the scientific names I inserted! The Mustang article has absolutely no indication of what specy the Mustang belongs to now! I swear this endless struggle between the My Little Ponyites and REAL BIOLOGISTS is like the Evolution vs. creationism argument, only dumber. Like I said, these people aren't calling for us to turn our rotweillers loose into the nearest forest, but why not? I mean, it's the same specy as the Gray Wolf. Domestication doesn't matter, if you listen to these people. If that's the case then why aren't we restocking mature Oak forests with farm raised white turkeys? I mean, it's the same specy, after all. Oh. And this is my favourite. Where Wild Asses are actually native they're critically endangered. But I have not read ONE WORD from the Cult of the Mustang and Burro about saving them from ACTUAL extinction, but get this, they want to have the Mustangs and Burros in America declared endangered species. How's that for mentally inept and savagely hypocritical?