Panda cubs Xi Lun and Ya Lun wakes up from their sleep and yawns dramatically at Zoo Atlanta in Atlanta, Georgia. Atlanta Zoo's playful panda cubs Xi Lun and Ya Lun are seen taking a nap. Xi Lun wakes up from their sleep and yawns dramatically. The two cubs were born at Zoo Atlanta in September 2013 to mother Lun Lun and are now four months old. (Photo by Smileybears/Flickr/ZooBorns/Barcroft Images)
