The zoo may have been closed, but the animals were busy.
Penguins are aquatic, flightless birds. They lay eggs, have feathers and yet are powerful swimmers. Emperor penguins can stay underwater up to 30 minutes, in essence flying underwater. They live in the Southern Hemisphere, including Antarctica and New Zealand. LiveScience.com has penguin pictures, feature article and news of the latest penguin discoveries.
Penguins must constantly shuffle their huddles to make sure all members of the crowd get a chance to stay warm in the middle.