In 1964, when he was not working at American Greetings, Crumb drew many "Fritz the Cat" strips for his own amusement. Some of these strips would later be published in "Help!" and "Cavalier" magazines and in the underground comix. Fritz also appears briefly in Crumb's graphic novel "Big Yum Yum Book: The Story of Oggie and the Beanstalk", drawn in 1964, but not published until 1975. Several characters from the anthropomorphic universe of "Fritz the Cat" appeared in another Crumb comic strip, "The Silly Pigeons", drawn in 1965 and intended for "Help!" In 1970, Crumb redrew an early Fuzzy the Bunny story written by Charles Crumb in 1952; it was published in "Zap Comix" #5.