The ALA’s “Challenged book list” is made up of all of the books that most frequently prompted people to call, write or visit a library and request that a particular book be removed from the collection. Homosexuality, religious viewpoint and “unsuited to age group” were some of the reasons given for removing “And Tango Makes Three” by those who objected to the book’s presence in libraries.
I haven’t read “And Tango Makes Three” (although ‘read’ may not be the right word since the book is mostly pictures). It apparently tells the story of a pair of male Emperor penguins named Roy and Silo at the Central Park Zoo in N.Y.C. who ‘coupled’ and then adopted and raised a chick which was not being properly cared for by it’s biological (and presumably hetero) penguin parents. I hear that the book is absent any sexual content. For some people, having children get access to a book that describes two male penguins raising a chick is apparently “too much.”