Two lions are seen at the Masai Mara National Reserve, Kenya, Aug. 30, 2021. The World Wildlife Day, which is marked annually on March 3 to raise the awareness on the world's wild animals and plants, is celebrated under the theme "Recovering key species for ecosystem restoration" this year. (Xinhua/Dong Jianghui)

An elephant is seen at the Masai Mara National Reserve, Kenya, Aug. 30, 2021. The World Wildlife Day, which is marked annually on March 3 to raise the awareness on the world's wild animals and plants, is celebrated under the theme "Recovering key species for ecosystem restoration" this year. (Xinhua/Dong Jianghui)

Elephants are seen at the Masai Mara National Reserve, Kenya, Aug. 30, 2021. The World Wildlife Day, which is marked annually on March 3 to raise the awareness on the world's wild animals and plants, is celebrated under the theme "Recovering key species for ecosystem restoration" this year. (Xinhua/Dong Jianghui)

Two Hippos are seen at the Masai Mara National Reserve, Kenya, Aug. 30, 2021. The World Wildlife Day, which is marked annually on March 3 to raise the awareness on the world's wild animals and plants, is celebrated under the theme "Recovering key species for ecosystem restoration" this year. (Xinhua/Dong Jianghui)

A lemur is seen in Moheli, Comoros, Jan. 8, 2022. The World Wildlife Day, which is marked annually on March 3 to raise the awareness on the world's wild animals and plants, is celebrated under the theme "Recovering key species for ecosystem restoration" this year. (Xinhua/Dong Jianghui)

来源：Xinhua