Police in San Francisco describe the scene when officers arrived at the zoo to help the men who were mauled.

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The San Francisco Zoo will be adding a fence, surveillance cameras and hot wire to an exhibit where a tiger escaped on Christmas Day. It killed one man and mauled two others. The zoo will remain closed for another day.

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of Andrew Baker, vice president of animal programs at the Philadelphia Zoo, discuss the precautions the zoo takes to preserve the safety of visitors.

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about the mating of Amur tigers Kira and Dmitri at the Philadelphia Zoo.

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of Amur tigers Kira and Dmitri.

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about the tiger cubs Terney, Changbai, and Koosaka's debut at the Philadelphia Zoo. Includes a photo gallery of the cubs.

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of the Philadelphia Zoo's tiger cubs playing in their new environment.

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about the female tiger cubs Terney, Changbai, and Koosaka and watch a video of the cubs.

For more information on the Philadelphia Zoo, visit the zoo

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