Zookeepers at the Vienna Zoo say twin panda cubs born in early August have opened their eyes and are becoming more active.
Giant panda Yang Yang gave birth to the male and female babies on Aug. 7.
Panda cubs usually begin to open their eyes at around 30 to 45 days old, and fully open them soon after that.
The zoo says the cubs have also started lifting their heads, kicking and playing on their mother’s belly.
