Same-sex penguins have been seen performing mating calls to one another and intertwining their necks. There have been a few gay penguin couples in Zoos that have been given abandoned eggs to raise chicks. They have raised these chicks successfully.
Famous penguin couples include: Roy & Silo, Inca & Rayas and Buddy & Pedro. Each of these couples is a separate subspecies of penguin, meaning that several subspecies of penguin has documented gay penguins.