Zoo keepers evaluated the four cubs, who had been born March 2, to see if they could safely navigate the moat in their enclosure.
May 6, 2014 Animal keeper J.T. Taylor carries the second of four 10-week-old lion cubs before their swim test at the National Zoo staff in Washington. The cubs must pass the test to show to the keepers that they will be safe in their outdoor habitat. Melina Mara/The Washington Post Buy Photo