求翻译：Over four summers, Lyon monitored 400 coot nests near Williams Lake in central British Columbia, tagging the eggs with a marker. OF these, 160 coot nests received eggs from unrelated coots. The hosts generally were not fooled, however. About half the time, coot parents rejected the strange eggs completely, usually by burying them deep in the nest. “Foreign eggs were not disappearing by chance是什么意思？

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