National Zoo Sumatran Tigers

This black-and-white handout photo provided by the Smithsonian's National Zoo, taken Aug. 7, 2013, shows a pair of Sumatran tiger cubs born Aug. 5, with their 4-year-old mother Damai, at the zoo in  Washington. The zoo announced Thursday that the cubs born to 4-year-old Damai on Monday appear to be healthy, and the new mother has been seen grooming and nursing them.  (AP Photo/Smithsonian's National Zoo)
This black-and-white handout photo provided by the Smithsonian's National Zoo, taken Aug. 7, 2013, shows a pair of Sumatran tiger cubs born Aug. 5, with their 4-year-old mother Damai, at the zoo in Washington. The zoo announced Thursday that the cubs born to 4-year-old Damai on Monday appear to be healthy, and the new mother has been seen grooming and nursing them. (AP Photo/Smithsonian's National Zoo)

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