A Sumatran tiger at the Sumatra Tiger Rescue Center near Bandar Lampung on the southern tip of Sumatra island Beawiharta /Reuters /Landov hide caption

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Beawiharta /Reuters /Landov

Dara Arista, 8, holds a photo of Sheila in front of the tiger's cage at the zoo in Jambi, Indonesia. Poachers had slaughtered Sheila during the night. Steve Winter/National Geographic hide caption

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Steve Winter/National Geographic

Listen to a Tiger Call for Her Mate (Hans Weise, National Geographic)

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