Like the classic animated Disney movies --"Bambi," for example, or "Dumbo" -- "Happy Feet" isn't afraid to get a little serious, a little dark. It isn't afraid to mix in some substance with its style.

Penguins were the subject of last year's Academy Award-winning documentary March of the Penguins. The flightless birds have hit theaters once again, this time in the animated film Happy Feet. This ...