Birds of a Feather recounts the story of Roy and Silo, the two Central Park Zoo chinstrap penguins who partnered, adopted an egg, hatched and raised a chick together. Roy and Silo are no strangers to the spotlight. In 2005, they were the subject of a widely contested children's book, And Tango Makes Three, by Peter Parnell and Justin Richardson. The book, temporarily pulled from school bookshelves in Loudoun County, became one of the most banned...