[dennisw]

Thu Jan 16, 5:26 PM ET

Penguins swim at the San Francisco Zoo in San Francisco Thursday, Jan. 16, 2003. A few penguins swimming leisurely at the San Francisco Zoo is nothing new. But dozens of them doing laps in unison for hours has zookeepers perplexed. It all started this past November when six newcomer Magellannic penguins were brought in. Since then the penguin pool at the San Francisco Zoo has been a daily frenzy of circle swimming by all of the 52 birds at once. (AP Photo/Marcio Jose Sanchez)

[dennisw]

Thu Jan 16, 6:36 PM ET

Penguins eat fish from the hands of zookeeper Jane Tollini at the San Francisco Zoo in San Francisco in Thursday, Jan. 16, 2003. A few penguins swimming leisurely at the San Francisco Zoo is nothing new. But dozens of them doing laps in unison for hours has zookeepers perplexed. It all started this past November when six newcomer Magellannic penguins were brought in. Since then the penguin pool at the San Francisco Zoo has been a daily frenzy of circle swimming by all of the 52 birds at once. (AP Photo/Marcio Jose Sanchez)