And Tango Makes Three by Justin Richardson and Peter Parnell has been on the American Library Associations (ALA) list of the most complained about books for five years.
It topped the list in 2007, 2008, and 2009.
The book, written by a gay couple, is based of the true story of penguins Roy and Silo, who formed a couple in New Yorks Central Park Zoo.
They attempted to hatch a rock, which was replaced by a rejected egg from a mixed gender couple by zookeepers.
They then adopted the baby penguin Tango as their own. The couple eventually split when Silo became interested in a female penguin.
The book has been accused of promoting homosexuality and being anti-family as well as unsuitable for its age group.
This years list includes Brave New World by Aldous Huxley; The Absolutely True Diary of a Part-Time Indian by Sherman Alexie; The Hunger Game by Suzanne Collins; and Stephenie Meyers Twilight.
Off the list this year are such classics as Alice Walkers The Color Purple; To Kill A Mockingbird by Harper Lee and Catcher in the Rye by JD Salinger.
Barbara Jones, director of ALAs Office for Intellectual Freedom, said: While we firmly support the right of every reader to choose or reject a book for themselves or their families, those objecting to a particular book should not be given the power to restrict other readers right to access and read that book.
Article by Jessica Geen and reproduced from www.pinknews.co.uk 13 April 2011