Dwarfs are native to Narnia. They are called Sons of Earth by Aslan, as opposed to humans, who are called Sons of Adam or Daughters of Eve. Dwarfs exist in at least two varieties: Black Dwarfs and Red Dwarfs, distinguished by the colour of their hair. While many Red Dwarfs are kind and loyal to Aslan, Black Dwarfs appear to be more selfish and hostile, and most fight on the White Witch's side. Dwarfs appearing in the books are male and live together in communities, although they are known to mingle with and reproduce with humans. For example, Prince Caspian's Tutor Cornelius is a half-dwarf, and Caspian's former nurse is described as "a little old woman who looked as if she had dwarf blood in her".