A wild duck is seen resting at the lakeside in Yuanmingyuan Park in Beijing, capital of China, May 15, 2022. (Xinhua/Li Xin)

A wild duck swims in the lake in Yuanmingyuan Park in Beijing, capital of China, May 15, 2022. (Xinhua/Li Xin)

Wild ducks swim in the lake in Yuanmingyuan Park in Beijing, capital of China, May 15, 2022. (Xinhua/Li Xin)

Tourists view a black swan in the lake in Yuanmingyuan Park in Beijing, capital of China, May 15, 2022. (Xinhua/Li Xin)

A magpie and a heron are seen in Yuanmingyuan Park in Beijing, capital of China, May 15, 2022. (Xinhua/Li Xin)