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

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Mixed grasses growing in a parcel of land enrolled in the Conservation Reserve Program is seen near Tribune, Kan. Millions of acres of CRP nationwide will be returned to farmland.

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