Japan zoo walks portly penguins

Penguins at a zoo in northern Japan have been taken on their first walk of the season in an attempt to keep them trim during the winter.

Asahiyama Zoo on the northern island of Hokkaido take its King Penguins on a 500-metre walk twice a day to stop them getting too fat during the cold months.

Spokesman Tetsuo Yamazaki said penguins gained weight in winter because they stood still to conserve energy.