Bad Bears in the Big City: An Irving and Muktuk Story by Daniel Pinkwater, illus. by Jill Pinkwater, finds the muffin-thieving polar bears sent in shackles from their home in Yellowtooth to the Bayonne, N.J., zoo. A note from Yellowtooth's Officer Bunny (""We hope you enjoy our bears. Remember, they are not to be trusted!"") ensures that the bears are confined to the zoo, but the muffin factory next door provides too great a temptation.