The marine mammal apparently noticed children doing laps around a course they had set up at the Marin Country Day School next to the shores of the San Francisco Bay, California, USA.

• 美国加州紧邻旧金山湾的马林县完全小学内，一群围著操场进行健走马拉松的学童，似乎吸引了这只海洋哺乳动物的目光。