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Visitors are flocking to see the characters in an unusual menage a trois at San Francisco zoo.

First, there's Harry. He met Pepper. They lived together and started to raise a surrogate family.

Not so strange, you might think. Except Harry and Pepper are penguins. And they're both male.

All was going well - Harry and Pepper were excellent fathers and raised a chick to adulthood. But then along flapped Linda, who stole Harry's heart.

Linda has more burrows and a greater status among the penguins at the zoo. Harry couldn't resist - but Pepper is now left; alone and bereft.

Outlook's Valerie Sanderson spoke to Harrison Edell. He's the curator in charge of the birds at San Francisco zoo. Harrison says that there may be a flicker of hope for a happy ending for Pepper.

After all - there are plenty more fish in the sea.