2021.

According to the query of iAsk Knowledge, the antelope leon and Dong Zichu were together in 2021. The antelope leon is a type of mammal with a shape similar to that of a goat. It refers to the saiga antelope produced in Xinjiang. Both males and females have horns. It has gray-yellow fur, brown-gray stripes on its face, slender limbs, fast running speed, and resistance to thirst.