Slimming Down Pudgy Penguins.

Penguins at the Asahiyama Zoo, Hokkaido, Japan are getting pudgy, so their zookeepers are instituting a winter exercise program:

"The penguins have tender webbed feet and can walk significant distances only on snow, so the program can take place only during the colder months."

http://www.cnn.com/2005/WORLD/asiapcf/12/15/plump.penguins.ap/index.html