Tiger in Attack Not Known for Violence

This undated photo provided by the San Francisco Zoo shows Tatiana, a female Siberian tiger that attacked its trainer shortly after a public feeding at the zoo Friday, Dec. 22, 2006, in San Francisco, according to spokesman Paul Garcia. (AP Photo/San Francisco Zoo)

(AP) -- A 350-pound Siberian tiger that mauled an experienced San Francisco Zoo keeper so badly she could lose her arm had no history of violence, prompting an investigation into what led to the vicious attack.

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