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Tiger escape raises safety concerns

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Caged tiger
A 300-pound tiger mauled three men after escaping its enclosure at the San Francisco Zoo.
China Photos/Getty Images

Officials are trying to figure out how a tiger escaped from its enclosure Tuesday at the San Francisco Zoo. The 300-pound tiger mauled three men -- one of them fatally -- before being shot to death by police. 

The animal had to get past a 15-foot-wide moat and 20-foot-high walls. The San Francisco Zoo was closed Wednesday and regarded as a crime scene.

In light of the incident in San Francisco, the Minnesota Zoo's Director of Biological Programs Kevin Willis joined "All Things Considered" host Tom Crann to discuss how animals are enclosed and treated at the Zoo in Apple Valley.