I was reading about draft horses and mustangs and here are a few facts that I found interesting; Some times Draft horses were abandoned due to economic failure or because they were replaced with a tractor, Other times they were deliberately introduced to "dilute" or "improve" the wild herds, by adding size and cooling the natural temperament of the "hot" Spanish horses. I found this interesting because its fun to see all the different sizes and shapes of all the different mustangs at the BLM sales.