The nation’s only giant panda twins turned one year old on Sunday, and the Atlanta Zoo held a birthday celebration for Ya Lun and Xi Lun over Labor Day weekend.

Through Monday, Sept. 4, visitors who wear black and white received $5 off general admission. The zoo is also offering 10% off purchases of Dippin’ Dots Pandamonium Crunch at Dippin’ Dots locations within the zoo.

Ya Lun and Xi Lun also received a special birthday surprise from the zoo’s celebrity ice cake-maker, King of Pops.