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)

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)