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Watch: Endangered Sumatran tiger cubs pass swim test

The 13-week-old Sumatran tiger cubs pass their swim reliability test and are cleared for their national debut on November 18.

The Smithsonian National Zoo's female Sumatran tiger cub Sukacita takes a swim reliability test at the zoo's moat in Washington, Wednesday, Nov. 6, 2013.
The Smithsonian National Zoo's female Sumatran tiger cub Sukacita takes a swim reliability test at the zoo's moat in Washington, Wednesday, Nov. 6, 2013.AP

Abby Borovitz