The most challenged book in school libraries this last year did not include violence, language or adult situations. It included penguins. “And Tango Makes Three” is the story of two male penguins who help a penguin couple who is having trouble incubating their own eggs.

The book is based on a true story, but this hasn’t stopped library patrons from calling for the books removal. The complaint apparently comes from the two male penguins having a perceived homosexual orientation.

Responses to the complaints have ranged from standing by the book, to relocating the book to the non-fiction section, to one school in North Carolina that pulled the book from library shelves though later returned it after protests from the community and the media.