updated 3/24/2008 3:04:41 PM ET 2008-03-24T19:04:41

A Sumatran tiger that gave birth last week at the San Francisco Zoo was hiding quite a surprise: triplets.

Zoo officials announced last Friday that Leanne had given birth to one cub. Since then, video and audio have been used to observe the mom and her newborn from a distance.

On Thursday, Leanne got up to get water and zoo staff confirmed three cubs in the nest box. She has been taking good care of them. The staff hopes to examine the cubs in the next few days.

The tiger species is endangered. Leanne and the father, George, were loaned for breeding from an aquarium in Denver and a zoo in San Antonio.

One of the San Francisco Zoo's tigers was killed after it escaped its pen Christmas Day and attacked three visitors, killing one.

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