LOUISVILLE, KY - MARCH 20:  Camilla, Duchess of Cornwall meets some mini donkeys as she talks to members of the charity The Brooke at Churchill Downs Racecourse on the fourth day of a visit to the United States on March 20, 2015 in Louisville, DC. The Prince and Duchess are in Washington as part of a Four day visit to the United States.  (Photo by Chris Jackson/Getty Images)