A Humboldt penguin swims in a pool during the opening of the new London Zoo penguin pool and beach, in London May 26, 2011. [Photo/Agencies]

Zoo keeper Rowena Fisher poses for photographers with a group of penguins, with a Rockhopper penguin next to her, during a photo-call to mark the opening of the new London Zoo penguin pool and beach, in London May 26, 2011. [Photo/Agencies]