Gary Cameron/Reuters
Smithsonian National Zoo biologist Leigh Pitsko carries out a male lion cub for its swim test in a moat in Washington, D.C., May 6, 2014.
Four, unnamed 10-week old lion cubs were tested today for their ability to swim and remove themselves from their zoo habitat moat.
Lion Cubs at the Smithsonian Zoo
Gary Cameron/Reuters
Smithsonian National Zoo biologist Leigh Pitsko releases a male lion cub for its swim test, May 6, 2014.
Lion Cubs at the Smithsonian Zoo
Gary Cameron/Reuters
Smithsonian National Zoo animal keeper J.T. Taylor releases a female lion cub for its swim test, May 6, 2014.
Lion Cubs at the Smithsonian Zoo
Gary Cameron/Reuters
Smithsonian National Zoo biologist Leigh Pitsko releases a male lion cub for its swim test, May 6, 2014.
Lion Cubs at the Smithsonian Zoo
Gary Cameron/Reuters
Smithsonian National Zoo animal keeper J.T. Taylor releases a female lion cub for its swim test, May 6, 2014.
Lion Cubs at the Smithsonian Zoo
Gary Cameron/Reuters
Smithsonian National Zoo animal keeper J.T. Taylor releases a female lion cub for its swim test, May 6, 2014.
Lion Cubs at the Smithsonian Zoo
Gary Cameron/Reuters
Smithsonian National Zoo animal keeper Kristen Clark chases a male lion cub during its swim test in the zoo habitat moat, May 6, 2014.
Lion Cubs at the Smithsonian Zoo
Gary Cameron/Reuters
Smithsonian National Zoo animal keepers J.T. Taylor and Kristen Clark carefully handle a female lion cub after its swim test, May 6, 2014.
Lion Cubs at the Smithsonian Zoo
Gary Cameron/Reuters
Smithsonian National Zoo animal keeper Marie Magnuson and zoo curator of cats Carig Saffoe are sprayed by a female lion cub after its swim test, May 6, 2014.
Lion Cubs at the Smithsonian Zoo
Gary Cameron/Reuters
Smithsonian National Zoo animal keeper J.T. Taylor carries out a female lion cub for its swim test, May 6, 2014.
Lion Cubs at the Smithsonian Zoo
Gary Cameron/Reuters
Smithsonian National Zoo animal keeper J.T. Taylor carries out a female lion cub for its swim test, May 6, 2014.