The Hungry Caterpillar is 40 years old! To celebrate the anniversary of the little caterpillar that started it all, March 20, 2009 has been designated "The Very Hungry Caterpillar Day." This is the day everyone is encouraged to read and enjoy again the antics of this wonderful creature, remembering that each of us has certain things that are unique just to us. The caterpillar can be enjoyed in a new pop-up book, in a book and memory game book, coloring books, board books and tapes. Over 29 million copies have sold worldwide in 45 languages.