Weighing over 200 grams each, a pair of male-female panda twins were born in Chengdu, capital of southwest China's Sichuan Province on July 6, according to the Chengdu Research Base of Giant Panda Breeding on Monday. /Photo via Chengdu Research Base of Giant Panda Breeding

The twin panda cubs are believed to be the heaviest captive-bred panda twins born in the world. The larger cub, born first with a birth weight of 211.6 grams, is male, while the smaller cub is female, weighing 209 grams. /Photo via Chengdu Research Base of Giant Panda Breeding

Female giant panda A Bao (named after the hit Hollywood animated blockbuster "Kung Fu Panda"), who was born in the U.S. in 2010 and returned to China in 2013, gave birth to the twins. The mother and twins are in stable condition, according to the base. /Photo via Chengdu Research Base of Giant Panda Breeding

The giant panda remains one of the world's most endangered species. The number of captive pandas was 548 globally as of last November. A total of 298 giant panda cubs have been born at the Chengdu research base as of Monday. /Photo via Chengdu Research Base of Giant Panda Breeding