Flap over a tale of gay penguins

It was a love story that touched the heart of New Yorkers. Two gay penguins at Central Park Zoo who - after trying unsuccessfully to hatch a rock - were given a fertilised egg and raised their own little chick called Tango.

The tale of Roy and Silo was even made into a children's book called And Tango Makes Three. But, while liberal Manhattanites may have sighed at the sweetness of it all, not every American seems quite so pleased. The book has caused controversy in a number of small towns in the American heartland, where teachers and parents have complained that it is not suitable for children.