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

itoggle caption Steve Winter/National Geographic

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.

Charlie Riedel/AP hide caption

itoggle caption Charlie Riedel/AP