 The white-tailed deer ("Odocoileus virginianus") was once classified as "Dama virginiana" and the mule deer or black-tailed deer ("Odocoileus hemionus") as "Dama hemionus"; they were given a separate genus in the 19th century.In more recent times, fallow deer have been introduced in parts of the United States.A small feral population exists on one barrier island in Georgia.