Hannah loves gorillas and longs to see a real one. Unfortunately, her father is always too busy -- or too tired -- to take her to the zoo. But on the night before her birthday, something extraordinary happens and Hannah's wish finally comes true. Anthony Browne's classic story of a girl's moonlit night of adventure, courtesy of a surprising and kindly friend, returns in a larger trim size with striking cover art by the artist for the book's thirtieth anniversary.