'Captain Underpants', the best-selling picture book series of Dav Pilkey, topped the list of the most banned and challenged books of 2013 for its "offensive language" and material not suited for the target age group.
The American Library Association has released the annual 'State of the Libraries' report of works most frequently "challenged" at schools and libraries, and Nobel laureate Toni Morrison's 'The Bluest Eye' has made it to the list for its language, along with violence and sexual content, the Huffington Post reported.
Sherman Alexie's prize-winning 'The Absolutely True Diary of a Part-Time Indian' ranked No. 3 for its drug references, sexual content and racism followed by E L James' 'Fifty Shades of Grey' and Suzanne Collins' 'The Hunger Games'.
Others in the top 10 were Tanya Lee Stone's 'A Bad Boy Can Be Good for A Girl', John Green's 'Looking for Alaska', Stephen Chbosky's 'The Perks of Being a Wallflower', Rudolfo Anaya's 'Bless Me, Ultima' and Jeff Smith's 'Bone' series.