Cocker Spaniel refers to two modern breeds of dogs of the spaniel dog type: the American Cocker Spaniel and the English Cocker Spaniel, both of which are commonly called simply Cocker Spaniel in their countries of origin. It was also used as a generic term prior to the 20th century for a small hunting Spaniel. Cocker Spaniels were originally bred as hunting dogs in the United Kingdom, with the term "cocker" deriving from their use to hunt the Eurasian Woodcock. When the breed was brought to the United States it was bred to a different standard which enabled it to specialize in hunting the American Woodcock. Further physical changes were bred into the cocker in the United States during the early part of the 20th century due to the preferences of breeders.