'Happy Feet' penguins plummet

Rockhopper penguins are seen in an undated file photo. Numbers of rockhopper penguins have plummeted in recent years, possibly due to climate change, a bird charity said in a warning over the creatures made into stars by the recent blockbuster "Happy Feet."(AFP/File)

LONDON (AFP) - Numbers of rockhopper penguins have plummeted in recent years, possibly due to climate change, a bird charity said in a warning over the creatures made into stars by the recent blockbuster "Happy Feet."