美洲白骨顶是一种鸟，它们生活在北美并且长得像野鸭。
其他研究人员并不相信这一理论。虽然争论还在继续，但动物会数数的事例越来越靠谱，因为一只白骨顶。
Other researchers aren't convinced. But though the debate goes on, the case for animal counting just got stronger... by the weight of one coot.
其他研究人员并不相信这一理论。虽然争论还在继续，但动物会数数的事例越来越靠谱，因为一只白骨顶。
Other researchers aren't convinced. But though the debate goes on, the case for animal counting just got stronger... by the weight of one coot.
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