Giant panda twin cubs Bao Di and Bao Mei play at the Pairi Daiza zoo in Brugelette, Belgium, Jan. 27, 2021. Pairi Daiza zoo hosts five giant pandas currently, including father Xing Hui, mother Hao Hao, and three children Tian Bao, Bao Di and Bao Mei. Bao Di and Bao Mei are twins born in August 2019 after the birth of Tian Bao in June 2016. (Xinhua/Zhang Cheng)

Giant panda Xing Hui plays at the Pairi Daiza zoo in Brugelette, Belgium, Jan. 27, 2021. Pairi Daiza zoo hosts five giant pandas currently, including father Xing Hui, mother Hao Hao, and three children Tian Bao, Bao Di and Bao Mei. Bao Di and Bao Mei are twins born in August 2019 after the birth of Tian Bao in June 2016. (Xinhua/Zhang Cheng)

Giant panda Hao Hao and her twin cubs Bao Di and Bao Mei play at the Pairi Daiza zoo in Brugelette, Belgium, Jan. 27, 2021. Pairi Daiza zoo hosts five giant pandas currently, including father Xing Hui, mother Hao Hao, and three children Tian Bao, Bao Di and Bao Mei. Bao Di and Bao Mei are twins born in August 2019 after the birth of Tian Bao in June 2016. (Xinhua/Zhang Cheng)

Giant panda cub Bao Di plays at the Pairi Daiza zoo in Brugelette, Belgium, Jan. 27, 2021. Pairi Daiza zoo hosts five giant pandas currently, including father Xing Hui, mother Hao Hao, and three children Tian Bao, Bao Di and Bao Mei. Bao Di and Bao Mei are twins born in August 2019 after the birth of Tian Bao in June 2016. (Xinhua/Zhang Cheng)

Giant panda twin cubs Bao Di and Bao Mei play at the Pairi Daiza zoo in Brugelette, Belgium, Jan. 27, 2021. Pairi Daiza zoo hosts five giant pandas currently, including father Xing Hui, mother Hao Hao, and three children Tian Bao, Bao Di and Bao Mei. Bao Di and Bao Mei are twins born in August 2019 after the birth of Tian Bao in June 2016. (Xinhua/Zhang Cheng)

Giant panda Tian Bao enjoys eating at the Pairi Daiza zoo in Brugelette, Belgium, Jan. 27, 2021. Pairi Daiza zoo hosts five giant pandas currently, including father Xing Hui, mother Hao Hao, and three children Tian Bao, Bao Di and Bao Mei. Bao Di and Bao Mei are twins born in August 2019 after the birth of Tian Bao in June 2016. (Xinhua/Zhang Cheng)

Giant panda Xing Hui is seen at the Pairi Daiza zoo in Brugelette, Belgium, Jan. 27, 2021. Pairi Daiza zoo hosts five giant pandas currently, including father Xing Hui, mother Hao Hao, and three children Tian Bao, Bao Di and Bao Mei. Bao Di and Bao Mei are twins born in August 2019 after the birth of Tian Bao in June 2016. (Xinhua/Zhang Cheng)

Giant panda Tian Bao enjoys eating at the Pairi Daiza zoo in Brugelette, Belgium, Jan. 27, 2021. Pairi Daiza zoo hosts five giant pandas currently, including father Xing Hui, mother Hao Hao, and three children Tian Bao, Bao Di and Bao Mei. Bao Di and Bao Mei are twins born in August 2019 after the birth of Tian Bao in June 2016. (Xinhua/Zhang Cheng)

Giant panda Hao Hao and her twin cubs Bao Di and Bao Mei enjoy eating at the Pairi Daiza zoo in Brugelette, Belgium, Jan. 27, 2021. Pairi Daiza zoo hosts five giant pandas currently, including father Xing Hui, mother Hao Hao, and three children Tian Bao, Bao Di and Bao Mei. Bao Di and Bao Mei are twins born in August 2019 after the birth of Tian Bao in June 2016. (Xinhua/Zhang Cheng)

Giant panda Tian Bao enjoys eating at the Pairi Daiza zoo in Brugelette, Belgium, Jan. 27, 2021. Pairi Daiza zoo hosts five giant pandas currently, including father Xing Hui, mother Hao Hao, and three children Tian Bao, Bao Di and Bao Mei. Bao Di and Bao Mei are twins born in August 2019 after the birth of Tian Bao in June 2016. (Xinhua/Zhang Cheng)

Giant panda Tian Bao enjoys eating at the Pairi Daiza zoo in Brugelette, Belgium, Jan. 27, 2021. Pairi Daiza zoo hosts five giant pandas currently, including father Xing Hui, mother Hao Hao, and three children Tian Bao, Bao Di and Bao Mei. Bao Di and Bao Mei are twins born in August 2019 after the birth of Tian Bao in June 2016. (Xinhua/Zhang Cheng)