And Tango Makes Three
Publisher: Simon and Schuster Children's Books
Roy and Silo are two boy penguins who live in the zoo in New York's Central Park. They like to spend all their time together, and so just as the boy and girl penguins begin to build nests, so do Roy and Silo.
But then eggs start to appear in all the other nests, and Roy and Silo's nest remains empty. So the penguin keeper gets the idea to give them an egg that's not wanted by another couple.
This is a really delightful story and the message behind it is subtle. It's a true story, and you can learn more about it in a note at the end.