Madison, WI, November 27, 2013 –– When Phil Yellott and his wife, Cara, of Red Oak, Texas, decided to get a couple of donkeys to use as guard animals to protect their livestock, they had no idea that within a year, they would be recognized worldwide. They began their search, and soon came across a pair of rare American Mammoth Jackstock geldings for sale on Craigslist – two brothers, ages 7 and 9.