Pandas celebrate their birthday

Pandas celebrate their birthday (DOMINIQUE FAGET/AFP/Getty Images)

Happy birthday cuties! Panda cubs Po and De De discover and then devour the cake made to celebrate their first birthday. The cubs were partying during celebration in their honor this month at the Madrid Zoo.

The panda cubs were born on September 7, 2010 in Madrid. They are the first giant panda twins to be born by artificial insemination outside China.