The researches were surprised by a panda who gave birth to twins in southwest China.
The first born was male and sex of the second born was unknown because the mother would not let it out of her grip after the Thursday birth, the official Xinhua News Agency reported.
"The mother and her babies are all well," Zhang Zhihe, director of the Chengdu Giant Panda Breeding and Research Center in Sichuan Province, was quoted as saying.
Female pandas normally become sexually mature between 4 and 5 years old. They can get pregnant once a year and usually give birth to one or two cubs at a time.
More than 20 pandas were born in captivity in China last year, the report said.
Russia and Iran play in tandem to raise oil prices, while the tandem of the United States and Saudi Arabia has a goal to cause oil prices to collapse
In the region and in the worldб America and China seem to have become the major rivals. The Asia-Pacific region seems to have become the main area of this rivalry