Lock 'Em Up: The Stories Behind 12 Banned Kids' Books

The national controversy over the true story of two male penguins from New York's Central Park Zoo, And Tango Makes Three, began in 2006, when Missouri parents asked two public libraries to remove it. Complaints also surfaced in Georgia, Tennessee, Iowa, Wisconsin, Indiana, and Illinois, and it topped the American Library Association's list of most frequently challenged books in 2006, 2007, 2008, and 2009, due to its promotion of the gay penguin lifestyle.