"Angry Birds" is flapping from touch screens to big screens, books and toys. Will one of the best-known mobile apps become an entertainment franchise?

There is a line of Angry Birds soft toys, Mattel is working on a board game and before long there will be a cartoon series, and, if all goes well, a film.

The popularity of the game shows no sign of slowing down with Angry Birds plush toys being hot items this holiday season.