Having recently seen the documentary March Of The Penguins I found this news story about Roy & Silo, two "gay penguins", especially interesting. As The San Francisco Chronicle reports:
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.
They even raised a baby penguin together.
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, and a chick, Tango, was born.
For the next 2 1/2 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. Gramzay is full of praise. "They did a great job," he said.
The full article goes on to desribe other instances of "gay" animal behavior if you'd like to read it just click on the link.