这种鸟 叫 半蹼鸻，文献说：   

The semipalmated plover (Charadrius semipalmatus) is a small plover. The genus name Charadrius is a Late Latin word for a yellowish bird mentioned in the fourth-century Vulgate. It derives from Ancient Greek kharadrios a bird found in ravines and river valleys (kharadra, "ravine"). The specific semipalmatus is Latin and comes from semi, "half" and palma, "palm". Like the English name, this refers to its only partly webbed feet.

 当时遇到两只，可能是两口子。这种鸟的警惕性很高，两口子保持一定的距离，遥相呼应

 两只半蹼鸻