N-COUNT A coot is a water bird with black feathers and a white patch on its forehead. 黑鸭
那就意味着它们能数数。
Sneak two in, the coot lays two fewer. Coots that successfully spotted intruders knocked them out again and then laid the same number they normally would.
多出两个陌生蛋，它们就会少生两个蛋。而那些认出闯入者的鸟则会将其赶走，然后生产通常相同数量的蛋。
All along this uninhabited shoreline, sea islands, salt marshes, and sandy beaches provide a perfect resting place for Tundra swans, coots, gallinules, and other water birds.
这条无人居住的海岸线上海岛、盐沼和沙滩为冻土天鹅、黑鸦以及其他水鸟提供了完美的栖息地。
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