Catwings

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Catwings is a series of four American children's picture books written by Ursula K. Le Guin, illustrated by S. D. Schindler, and originally published by Scholastic from 1988 to 1999. It follows the adventures of kittens who were born with wings. Alternatively, Catwings is the first book in the series. The series is in print from Scholastic as of August 2015.
In Britain the series was published in two omnibus volumes as Tales of Catwings and More Tales of the Catwings. In America the 2003 editions were available in a boxed set of four with slipcase title The Catwings Collection, 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". The series is covered by the Internet Speculative Fiction Database, which classifies the volumes as short fiction and as chapbooks.
Scholastic Book Guides, a series for schoolteachers, includes one Catwings volume.
In 2002 and 2003 as Catwings 5 and Catwings 6, Le Guin published online editions of picture books "by Mrs. Katz's First Grade Class".