Your morning adorable: Madrid Zoo's giant panda twins are growing
Well, like all panda cubs, they've gotten a heck of a lot cuter with age.
According to the zoo, the cubs, both of which are thought to be male, are healthy and growing at a normal rate. They're beginning to get squirmy and noisy, but mother Hua Zui Ba is reportedly devoted and gentle. Hua Zui Ba and the cubs' father, Bing Xing, arrived in Madrid through a loan agreement with China in 2007.
The cubs, which won't receive their official names until they are 100 days old, were conceived through artificial insemination. They're the first set of giant panda twins to be conceived using the method outside of China, China's official news agency Xinhua reports.
See more photos of the cubs after the jump!
-- Lindsay Barnett
1st photo: J.J. Guillen / European Pressphoto Agency
2nd-7th photos: Andrea Comas / Reuters
8th-9th photos: Jasper Juinen/Getty Images