The information on how the Curly Horse came to be are as varied as the people who own them and the horses themselves. The issue is hotly debated and largely unknown so I will give you as much information as I can and you can make up your own mind. Personally, I think they are because Mother Nature is wonderous in her variety and felt like spicing things up a bit. My advice to people that I talk to is to ask around, talk to other owners, and definitely meet a Curly in "person".
Curly Horse Country - History Page
The American Bashkir Curly Horse Registry
The Curly Horse Pedigree Website
About the Dameles
Curlies Austria Page