Sea lions sleep together at Fisherman's Wharf in San Francisco, the United States, Aug. 17, 2019. (Xinhua/Wu Xiaoling)
Sea lions sleep together at Fisherman's Wharf in San Francisco, the United States, Aug. 17, 2019. (Xinhua/Wu Xiaoling)
Sea lions sleep together at Fisherman's Wharf in San Francisco, the United States, Aug. 17, 2019. (Xinhua/Wu Xiaoling)