The only giant panda twins in the U.S., Ya Lun and Xi Lun, turned 4 on September 3, 2020. The Panda Care Team packed the twins’ dayroom area with special birthday enrichment, including ice “cakes” shaped in the numeral 4, sugarcane “candles” with sweet potato “flames,” and birthday boxes filled with favorite treats such as leafeater biscuits, apples, bananas, and sweet potatoes.