Zoo Atlanta is soon expecting the first panda birth in U.S. this year . Thirteen-year-old Lun Lun was artificially inseminated . The zoo says it will be a "joyous moment" for all of its pandas and their caregivers.
Zoo Atlanta is soon expecting the first panda birth in U.S. this year . Thirteen-year-old Lun Lun was artificially inseminated . The giant panda is an endangered species .