Behavior: Penguins On the Go

If you're stuck in a pond in the San Francisco Zoo, it's not easy to swim to South America. That, however, is what a flock of 52 penguins appears to have been trying to do since Christmas Eve, and zookeepers admit they have no idea how to get them to stop.

The trouble started when six penguins from Sea World in Aurora, Ohio, were shipped out to join the San Francisco group. The West Coasters had filled their days with an easy routine: eating, preening and paddling in their 130-ft. by 40-ft. pool. From November to February, they had retreated to...

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