Four pandas, including a set of twins, were born in captivity within 14 hours of each other in China.

The births, Saturday and into Sunday, were all at the Chengdu Panda Breeding Research Centre in south-west Sichuan province, the largest facility for captive Panda's in the world with 71 panda's, according to China's official news station, Xinhua.

The births are a coup to the facility, as panda's are an endangered species who have relatively inactive mating habits. Loss of habitat has dwindled the numbers of pandas in the world, but scientists are working to grow the population.

Female pandas only ovulate once a year, so there is a small window of time in which she can become pregnant, however scientists have developed a method of artificial insemination that has been successful in panda procreation.

Nearly 1,600 panda's live in the wild in central China in a few mountain ranges in Sichuan, Shaanxi, and Gansu provinces. The bears normally lived in the low-lands, but have been forced to higher elevations due to man made developments, farming and forest clearing.