The twin panda cubs at Zoo Atlanta got their first taste of the outdoors on Monday, March 27. Ya Lun and Xi Lun are the only giant panda twins in the United States and will be seven months old next week.Video of the twins shows them climbing and exploring the outdoor area, and zoo visitors were able to catch a glimpse of their playtime. The zoo had them practice climbing out of the dry moat, an important step for the cubs to spend time outside. The zoo said the twins “passed with flying colors.”