Created by Dorothy Wall in 1933 , the character appeared in several books .
Created by Dorothy Wall in 1933 , the character has been the subject of films , TV series , merchandise , and a 1986 environmental song by John Williamson .
Created by Dorothy Wall in 1933 , the character appeared in several books and has been the subject of films , TV series , merchandise , and a 1986 environmental song by John Williamson .