The mother of the only giant panda twins to be born in the US has delivered a second set of twins, Zoo Atlanta has confirmed.
Three years ago, Lun Lun gave birth to two female cubs, Mei Lun and Mei Huan, who are still at the zoo in Georgia.
Panda pregnancies, famously rare in captivity and outside of China, are notoriously hard to establish or predict. The rarest member of the bear family, with roughly 1,864 in the wild, live mainly in bamboo forests high in the mountains of western China.
The birth comes after another set of twin panda cubs, born at a zoo in Vienna, Austria, turned 28 days old on Saturday. They are said to be fit and healthy and very cute.