Two newborn pandas have become the latest additions to Madrid Zoo, after being conceived through artificial insemination.

The hairless twins weighed just five ounces each. 

The pandas are the first born in Madrid Zoo since it unveiled Chu-Lin in 1982, the first panda born in captivity in Europe.

The zoo used artificial insemination, because it is extremely difficult for pandas in captivity to conceive naturally.

There are only an estimated 1,600 pandas left living in the wild in China, their numbers depleted by destruction of their habitat.