'Migrating' Zoo Penguins Play Follow the Leader
At the San Francisco Zoo, six new penguins have had the rest of the group swimming in circles for the past month. The newcomers appear to have sparked a "migration" trend after the rest of the flock had enjoyed 19 years of sedentary life. The behavior is rare in captivity. NPR's John Ydstie speaks with zookeeper Jane Tollini.
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