The Gruffalo said that no gruffalo should Ever set foot in the deep dark
wood. ... "Because if you do The Big Bad Mouse will be after you." The Gruffalo's Child was bored, and she snuck out alone at night to find out whether there really was a Big, Bad Mouse. By the end of the story, she wasn't bored anymore.
"The Gruffalo" is also available from Bookshare.