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A one-month-old female cheetah cub, left, delivered via a rare caesarian section, and her brother, right, delivered naturally but then abandoned by their mother, are held by their keepers after a feeding at the National Zoo in Washington, Wednesday, May 23, 2012. (AP Photo/Jacquelyn Martin)

Cheetah cubs

Two cheetah cubs have been transported to the Smithsonian's National Zoo May 23 to be raised by hand after a risky birth three weeks ago at the Smithsonian Conservation Biology.