Gil Myers/Smithsonian's National Zoo
  • President Grover Cleveland signed a bill passed by Congress that officially established the National Zoo and allocated funds for the purchase of land March 2, 1889, in Washington, D.C.
    Smithsonian's National Zoo
  • In this undated file photo, a group of children are pictured viewing American bison at the Smithsonian's National Zoo in Washington, D.C.
    Smithsonian's National Zoo
  • A male dama gazelle calf is pictured with its mother, Fahima, at the Smithsonian's National Zoo Oct. 13, 2012, in Washington, D.C.
    Gil Myers/Smithsonian's National Zoo
  • A 7-year-old sand cat named Thor is pictured at the Smithsonian's National Zoo Apr. 24, 2013, in Washington, D.C.
    Connor Mallon/Smithsonian's National Zoo
  • African lions are pictured at the Smithsonian's National Zoo Oct. 16, 2011, in Washington, D.C.
    John McRay/Smithsonianâ??s National Zoo
  • A mother sea lion, Cali, and 2-year-old pup, Sophie, are pictured at the Smithsonian's National Zoo Aug. 28, 2012, in Washington, D.C.
    Mark Van Bergh/Smithsonian's National Zoo
  • A sloth bear cub, Hank, and his mother, Hana, are pictured at the Smithsonian's National Zoo June. 17, 2013, in Washington, D.C.
    Janice Sveda/Smithsonian's National Zoo
  • A male white-naped crane chick and adult are pictured at the Smithsonian's National Zoo April 16, 2013, in Washington, D.C.
    Chris Crowe/Smithsonian's National Zoo
  • A cheetah is pictured at the Smithsonian's National Zoo, Dec. 10, 2013 in Washington, D.C.
    Abby Wood/Smithsonian's National Zoo
  • A group of flamingos are pictured at the Smithsonian's National Zoo Dec. 10, 2013, in Washington, D.C.
    Abby Wood/Smithsonian's National Zoo
  • Giant panda cub Bao Bao is pictured at the Smithsonian's National Zoo Jan. 6, 2014, in Washington, D.C.
    Abby Wood/Smithsonian's National Zoo
  • A red panda is pictured at the Smithsonian's National Zoo Jan. 21, 2014, in Washington, D.C.
    Abby Wood/Smithsonian's National Zoo
  • North American river otters are pictured at the Smithsonian's National Zoo Jan. 21, 2014, in Washington, D.C.
    Abby Wood/Smithsonian's National Zoo
  • A female gray seal pup is pictured at the Smithsonian's National Zoo Jan. 23, 2014, in Washington, D.C.
    Christina Castiglione/Smithsonian's National Zoo
  • An African lion cub is pictured at the Smithsonian's National Zoo Feb. 5, 2014, in Washington, D.C.
    Karen Abbott/Smithsonian's National Zoo
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