A pair of three-month-old Sumatran tiger cubs named ‘Bandar’ and ‘Sukacita’ were given a swimming test in a moat at the ‘Great Cats’ exhibit located in the National Zoo in Washington, D.C., on November 6, 2013. Photo credit: Gary Cameron / Reuters, Manuel Balce Ceneta / AP, Win McNamee / Getty Images A pair of three-month-old Sumatran tiger cubs named ‘Bandar’ and ‘Sukacita’ were given a swimming test in a moat at the ‘Great Cats’ exhibit located in the National Zoo in Washington, D.C., on November 6, 2013. Photo credit: Gary Cameron / Reuters, Manuel Balce Ceneta / AP, Win McNamee / Getty Images A pair of three-month-old Sumatran tiger cubs named ‘Bandar’ and ‘Sukacita’ were given a swimming test in a moat at the ‘Great Cats’ exhibit located in the National Zoo in Washington, D.C., on November 6, 2013. Photo credit: Gary Cameron / Reuters, Manuel Balce Ceneta / AP, Win McNamee / Getty Images A pair of three-month-old Sumatran tiger cubs named ‘Bandar’ and ‘Sukacita’ were given a swimming test in a moat at the ‘Great Cats’ exhibit located in the National Zoo in Washington, D.C., on November 6, 2013. Photo credit: Gary Cameron / Reuters, Manuel Balce Ceneta / AP, Win McNamee / Getty Images

A pair of three-month-old Sumatran tiger cubs named ‘Bandar’ and ‘Sukacita’ were given a swimming test in a moat at the ‘Great Cats’ exhibit located in the National Zoo in Washington, D.C., on November 6, 2013. Photo credit: Gary Cameron / Reuters, Manuel Balce Ceneta / AP, Win McNamee / Getty Images