 She is also the single author of a series entitled "Bloodline" under no pseudonym.When working on "Warriors", Cary, Baldry, Holmes, and Sutherland write under the pseudonym of Erin Hunter.This was decided by the fact that the name 'Erin' sounded like a strong Celtic name without much 'girliness', whilst 'Hunter' was both associated with cats and would place it next to the "Redwall" series, which was the only book the writers felt it could be compared to at the time.