The twins were born in September as part of a breeding program to preserve the endangered species.
Its discovery adds to evidence the charismatic bears did not originate in China - but migrated there.
A limited number of fans will be able to see male cub Xiao Xiao and its sister Lei Lei at Tokyo's Ueno Zoo through Friday before the park closes off viewings.
The perfect environment created for wild pandas has made them too comfortable to feel the urge to breed, says report.
In need of cheering up today? Look no further than this viral video of a panda loudly chomping away on a carrot.
Scientists, religious leaders and entrepreneurs are calling to "flatten the curve" of climate change's negative effects, as the COVID-19 lockdown has seen air quality skyrocket and industrial pollution decline.
Tucker Carlson discussed the threat of pandas rather than the legal peril involving the president's inner circle.
Zookeepers believe this panda has an attitude.
They're really bad at sex, they all belong to China, and more panda trivia.
Panda numbers are on the rise, but humans are pushing our closest ape relatives to extinction.