ATLANTA -- A spokeswoman for Zoo Atlanta says the zoo's pregnant giant panda, Lun Lun, has given birth to twins.
Zoo Atlanta spokeswoman Keisha Hines said Monday that officials weren't immediately sure of the cubs' genders. Lun Lun went into labor Monday afternoon and gave birth hours later.
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An ultrasound on June 30 determined Lun Lun was pregnant with her fourth cub. Zoo officials said they were surprised to see her deliver a fifth cub, and Hines says it's the first twin panda birth in Zoo Atlanta history.
As of Tuesday afternoon, Lun Lun and her cubs were in good health. Zoo Atlanta veterinarians are alternating the cubs so both can be nursed by mom.
However, Nurses have not been able to swap the cubs as frequently as they would like. Both cubs are being supplemented with formula and they are progressing well, at this time.
Officials have said Lun Lun's cub would be the first giant panda to be born in the U.S. this year.