"Roy and Silo, two chinstrap penguins at the Central Park Zoo in Manhattan, are completely devoted to each other. For nearly six years now, they have been inseparable. They exhibit what in penguin parlance is called 'ecstatic behavior': that is, they entwine their necks, they vocalize to each other, they have sex. Silo and Roy are, to anthropomorphize a bit, gay penguins. When offered female companionship, they have adamantly refused it. And the females aren't interested in them, either.
Love That Dare Not Squeak Its Name
At one time, the two seemed so desperate to incubate an egg together that they put a rock in their nest and sat on it, keeping it warm in the folds of their abdomens, said their chief keeper, Rob Gramzay. Finally, he gave them a fertile egg that needed care to hatch. Things went perfectly. Roy and Silo sat on it for the typical 34 days until a chick, Tango, was born. For the next two and a half months they raised Tango, keeping her warm and feeding her food from their beaks until she could go out into the world on her own."

"So what if animals are gay? Are people vindicated in our diverse sex lives by diversity in animals? If they put us on trial, can we bring as character witnesses lions who make the Sign of the Great Tawny Beast with same-sex lions? (And they do. Unless that's just a greeting.) No, not unless we would bring those same lions to testify that killing your new significant other's children is a useful way to free up their time for you and your future children. Animals do all kinds of things that we frown on for ourselves.
The fabulous kingdom of gay animals
But we can bring the lions to testify that there's nothing unnatural about human sex lives, that bisexuality and homosexuality are not among those twisted human inventions, like income tax, or graduate school, or step aerobics, that have no close analog in the wild. "