The American Library Association has released its annual list of most challenged books, and it includes titles both recent (The Absolutely True Diary of a Part-Time Indian, the Twilight series) and classic (Brave New World). Topping the 2010 list is And Tango Makes Three, a children's book about a same-sex penguin couple and its adopted baby.

Every year, the ALA ranks the most challenged books in the country, with "challenge" defined as "a formal, written complaint filed with a library or school requesting that a book or other material be restricted or removed because of its content or appropriateness." The ALA received 348 challenges last year.

Here are the 10 most challenged books of 2010:

See our take on the most challenged books of 2009.