Watch the mesmerising moment a group of herons stand motionless in a flowing lake - "like soldiers standing to attention."<br /><br />Scattered across the water, the birds hold their rigid positions as the gentle current flows around them.<br /><br />The video was filmed on March 11 in Chengdu, Sichuan province, China, after the mesmerizing scene drew crowds.<br /><br />Some speculated that the birds were simply feeling the movement of the water, while others wondered what they were waiting for.<br /><br />One witness likened them to "soldiers standing to attention".
