The most likely reason for this is that male plovers outnumber females.

导致这种现象最可能的原因是雄性?鸟比雌性多。

Plovers aren't the only oyster-eaters that might be at risk from oil-tainted food: Many of the oysters for human consumption in the United States come from beds along the Gulf Coast.

因为牡蛎受到石油污染而面临病从口入威胁的生物并不止环颈鸻一种，美国人所消费的大部分牡蛎都来自于墨西哥湾沿岸的海床上。