Monkey theft, leopard escape at Dallas Zoo raise questions about safety of animals

The mystery of two missing monkeys and the death and disappearance of other animals from the Dallas Zoo has captured the country’s attention over the last couple of weeks. Wednesday at the Houston Zoo, zookeepers are on high alert after a cut was discovered in the mesh fence around the pelican habitat. As Stephanie Sy reports, authorities are still trying to pin down exactly what has happened.

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