Tiny tigers face swim test

A 3-month-old Sumatran tiger cub named "Bandar" shows his displeasure after being dunked in the tiger exhibit moat for a swim reliability test at the National Zoo in Washington, Nov. 6, 2013.

All cubs born at the zoo must take a swim test before being allowed to roam in the exhibit. Bandar passed his test.

A female Sumatran Tiger cub named Sukacita is lifted by biologist Leigh Pitsko (R) after the cub performed her "swim test" in a moat of the Great Cats exhibit at the National Zoo, Nov. 6, 2013.

Sukacita is one of two Sumatran Tigers born Aug. 5, 2013. The cubs must be able to keep their heads above water, navigate the shallow end of the moat, and have the strength and agility to climb onto dry land on their own.

Sukacita is lowered into the tiger exhibit moat for a swim reliability test at the National Zoo, Nov. 6, 2013.

Sukacita takes a swim reliability test at the zoo's moat in Washington, Nov. 6, 2013.

A male Sumatran Tiger cub named Bandar performs his "swim test" in a moat of the Great Cats exhibit at the National Zoo, Nov. 6, 2013.

Sukacita is lifted by biologist Leigh Pitsko after the cub performed her "swim test" in a moat of the Great Cats exhibit at the National Zoo Nov. 6, 2013.

Sukacita is toweled off after passing her swim reliability test in the moat at the tiger exhibit at the National Zoo in Washington, Nov. 6, 2013.

Bandar performs his "swim test" in a moat of the Great Cats exhibit at the National Zoo, Nov. 6, 2013.

Sukacita paddles across the tiger exhibit moat during her swim reliability test at the National Zoo in Washington, Nov. 6, 2013.

Sukacita is dried off by biologist Leigh Pitsko after the cub performed her "swim test" in a moat of the Great Cats exhibit at the National Zoo, Nov. 6, 2013.

Bandar performs his "swim test" in a moat of the Great Cats exhibit at the National Zoo Nov. 6, 2013.

CBS News 24/7