Justin Richardson is a doctor, Peter Parnell a playwright, and Henry Cole an illustrator. How they all came together to create this true story is a mystery to me, but I'm glad they did. There's an ignorant but powerful element out there who believe that same sex relationships are an abomination, and also a choice made by people, although they can never explain why people would make a choice to become victims of the abuse and violence aimed at them by these same vile people who think they somehow have the right to dictate how everyone else should live. Wrong!
And nature itself proves them wrong - very wrong. It's not a human choice, it's a perfectly natural happenstance. Gender isn't binary. It's a sliding scale which can slide one way or another throughout life, and it's not a human thing but an animal thing - and I mean that in a generic sense, not a punitive one. We are all animals, and many animals have LGBTQ members. This book amply demonstrates that by telling the true story of two male penguins who decided they wanted to emulate any reproductive couple.
Roy and Silo (who have their own Wikipedia entry!) are chinstrap penguins who built a nest and tried to hatch a rock. This doesn't work. Rather than have them trying to steal another couple's egg, some inspired and inspiring members of the zoo staff gave them an egg from a cis couple who were not able to hatch two eggs. Roy and Silo successfully hatched the egg and raised 'their' daughter - Tango - successfully. Evidently taking her cue from her parents, Tango herself paired with a female penguin called Tanuzi, although this part of the story doesn't appear in this book.
This book was listed among the top-ten banned books for five years, which is why everyone ought to read it. I commend it. It plays a little bit fast and loose with the true story, but not by much and it's still worth reading even so.