Giant panda Ding Ding enjoys a birthday meal at the Moscow Zoo in Moscow, capital of Russia, on July 31, 2022. The Moscow Zoo on Sunday celebrated the birthdays of two giant pandas Ding Ding and Ru Yi. Six-year-old male Ru Yi was born on July 31, 2016 whereas five-year-old female Ding Ding was born on July 30, 2017. The pair arrived in Moscow in 2019 from China's southwestern province of Sichuan for a 15-year joint research program. Photo:Xinhua

Giant panda Ding Ding enjoys a birthday meal at the Moscow Zoo in Moscow, capital of Russia, on July 31, 2022. The Moscow Zoo on Sunday celebrated the birthdays of two giant pandas Ding Ding and Ru Yi. Six-year-old male Ru Yi was born on July 31, 2016 whereas five-year-old female Ding Ding was born on July 30, 2017. The pair arrived in Moscow in 2019 from China's southwestern province of Sichuan for a 15-year joint research program. Photo:Xinhua

Visitors look at giant panda Ru Yi at the Moscow Zoo in Moscow, capital of Russia, on July 31, 2022. The Moscow Zoo on Sunday celebrated the birthdays of two giant pandas Ding Ding and Ru Yi. Six-year-old male Ru Yi was born on July 31, 2016 whereas five-year-old female Ding Ding was born on July 30, 2017. Photo: Xinhua

Visitors look at giant panda Ru Yi at the Moscow Zoo in Moscow, capital of Russia, on July 31, 2022. The Moscow Zoo on Sunday celebrated the birthdays of two giant pandas Ding Ding and Ru Yi. Six-year-old male Ru Yi was born on July 31, 2016 whereas five-year-old female Ding Ding was born on July 30, 2017. Photo: Xinhua

Giant panda Ding Ding feeds on bamboos at the Moscow Zoo in Moscow, capital of Russia, on July 31, 2022. Photo: Xinhua

Giant panda Ding Ding plays with a toy at the Moscow Zoo in Moscow, capital of Russia, on July 31, 2022. Photo: Xinhua