Title: Catwings (Catwings Series #1), Author: Ursula K. Le Guin
Title: Catwings Return (Catwings Series #2), Author: Ursula K. Le Guin
Title: Wonderful Alexander and the Catwings (Catwings Series #3), Author: Ursula K. Le Guin
Title: Jane on Her Own (Catwings Series #4), Author: Ursula K. Le Guin