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.
NPR transcripts are created on a rush deadline by an NPR contractor. This text may not be in its final form and may be updated or revised in the future. Accuracy and availability may vary. The authoritative record of NPR’s programming is the audio record.