( CNN ) -- Giant panda Lun Lun is pregnant , and officials at the Atlanta , Georgia , zoo say they are thrilled . Animal and veterinary teams estimate that a birth could occur in 10 days to two weeks . It would be the first panda birth in the U.S. this year . Memphis , San Diego and Washington , D.C. , zoos also have pandas , but none has produced a baby panda this year . Thirteen-year-old Lun Lun was artificially inseminated , and the father is Zoo Atlanta 's Yang Yang . Lun Lun and 13-year-old Yang Yang have already given birth to two cubs -- Mei Lan , a 4-year-old female who now lives in China , and a male , Xi Lan , 2 , who resides at Zoo Atlanta . The giant panda is an endangered species , so another birth is good news for the zoo and , of course , the species . `` We 're absolutely excited about the news , '' said Rebecca Snyder , the curator of mammals at Zoo Atlanta . `` Many times , zoo handlers are not aware that a panda is pregnant until after the birth , so to know ahead of time is a special treat . '' ' Lun Lun was artificially inseminated on June 13 after the pair failed to mate naturally . Zoo Atlanta said giant panda gestation periods have been documented to be as short as 83 days or as long as 197 days , and the average pregnancy is 135 days . Ultrasound procedures will track the progress of the developing fetus , zoo officials said . Fans of the panda can watch Lun Lun on the zoo 's PandaCam , which runs Monday through Friday from 10 a.m. to 5 p.m . ET . Lun Lun and Yang Yang were born in China . They have lived with each other since they were 1 and came as a pair to Zoo Atlanta in 1999 . Lun Lun 's birth name , given to her by keepers , was Hua Hua , and Yang Yang 's birth name was Jiu Jiu .
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.