Juja Wislander is a Swedish children's writer. She is best known as the author of a series of short stories about the inquisitive cow Mama Mu and the philosophizing crow Krax, with illustrations by Sven Nordqvist.
Yuya designed the characters with her husband Thomas. Mama Mu and Krux appeared as the heroes of a radio play and children's songs, and only in 1991 the first book was published.
