 In America the 2003 editions were available in a boxed set of four with slipcase title "The Catwings Collection" (Orchard/Scholastic), listed as "Catwings Set" by Powell's Books.Scholastic classifies the "Catwings" books as fantasy and classifies the first two by "interest level" as "grades 2–5", the last two as "grades preK–3" (children of ages about 7–11 and 4–9 respectively).The series is covered by the Internet Speculative Fiction Database, which classifies the volumes as short fiction and as chapbooks.