Mustangs and Mules! Carter Reservoir mustangs & Belgian draft mules to be exact. I started a nonprofit for the Carter mustangs because I had long thought they were special. Carter Reservoir Mustangs Inc (CRMI) tested 10 Carters and they all tested to have Spanish Iberian decent. I have lots more research, documenting and testing to do, but it has become a passion of love for these beautiful wild horses.