There are many mallard ducks here.
这里有许多野鸭子。
The researchers lined up groups of mallard ducks and videotaped them while they slept.
研究员将一组野鸭围在一起，然后在它们人睡的时候进行录像。
Other studies have found that SCCPs can cause slight egg shell thinning in mallard ducks and can damage the livers of otters.
其它研究发现，SCCP能造成绿头鸭蛋壳轻微变薄，并能损害水獭的肝脏。
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