Smithsonian

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Great Cats and Bears curator Craig Saffoe caries away male sumatran tiger cub Bandar, who does not look happy after being tossed into the water in his enclosure as a swim test to make sure he is capable of swimming and getting out of the water without any trouble at the Smithsonian National Zoological Park, Washington, D.C., Wednesday, November 6, 2013. (Andrew Harnik/The Washington Times)

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Male sumatran tiger cub Bandar runs away after being tossed into the water in his enclosure as a swim test to make sure he is capable of swimming and getting out of the water without any trouble at the Smithsonian National Zoological Park, Washington, D.C., Wednesday, November 6, 2013. (Andrew Harnik/The Washington Times)

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Female sumatran tiger cub Sukacita reacts as Great Cats biologist Leigh Pitsko drops her into the water surrounding her enclosure as a swim test to make sure she is capable of swimming and getting out of the water without any trouble at the Smithsonian National Zoological Park, Washington, D.C., Wednesday, November 6, 2013. (Andrew Harnik/The Washington Times)

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Female sumatran tiger cub Sukacita is toweled off after Great Cats biologist Leigh Pitsko, right, droped her into the water surrounding her enclosure as a swim test to make sure she is capable of swimming and getting out of the water without any trouble at the Smithsonian National Zoological Park, Washington, D.C., Wednesday, November 6, 2013. (Andrew Harnik/The Washington Times)

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Male sumatran tiger cub Bandar reacts after being tossed into the water in his enclosure as a swim test to make sure he is capable of swimming and getting out of the water without any trouble at the Smithsonian National Zoological Park, Washington, D.C., Wednesday, November 6, 2013. (Andrew Harnik/The Washington Times)

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Male sumatran tiger cub Bandar reacts after being tossed into the water in his enclosure as a swim test to make sure he is capable of swimming and getting out of the water without any trouble at the Smithsonian National Zoological Park, Washington, D.C., Wednesday, November 6, 2013. (Andrew Harnik/The Washington Times)

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The Smithsonian National Zoo released this image of its giant panda cub during a checkup on Oct. 30.

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This photo provided by the Smithsonian's National Zoo shows Mei Xiang's giant panda cub undergoing an exam on Oct. 11, 2013, at the zoo in Washington. The zoo was set to reopen on Friday, though the popular panda cam went live on Thursday morning, Oct. 17. By Oct, 11 exam, the cub had both her eyes partially open and she now is reacting to the noises she hears in the panda house. (AP Photo/Smithsonian National Zoo, Bill Clements)

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This handout photo provided by the Smithsonian's National Zoo, taken Aug. 29, 2013, shows teh zoo's Panda mother Mei Xiang with her cub at the zoo in Washington. The zoo said Thursday its 2-week-old giant panda cub is female. The Washington zoo also revealed Thursday that the cub's father is National Zoo panda Tian Tian. (AP Photo/Smithsonian's National Zoo)

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In this photo provided by the Smithsonian's National Zoo, a member of the panda team at the Smithsonian’s National Zoo performs the first neonatal exam Sunday, Aug. 25, 2013, on a giant panda cub born Friday, Aug. 23, in Washington. The cub appeared to be in excellent health, zookeepers reported after a 10-minute physical exam Sunday morning. (AP Photo/ Smithsonian's National Zoo, Courtney Janney)