燕子每年過冬都要重回北方，為何不尋找以前住過的巢穴，而是選擇再築新居呢？ #科普頻道#科普#燕子#動物

燕子每年過冬都要重回北方，為何不尋找以前住過的巢穴，而是選擇再築新居呢？ #科普頻道#科普#燕子#動物

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燕子每年過冬都要重回北方，為何不尋找以前住過的巢穴，而是選擇再築新居呢？ #科普頻道#科普#燕子#動物 8:41
燕子每年過冬都要重回北方，為何不尋找以前住過的巢穴，而是選擇再築新居呢？ #科普頻道#科普#燕子#動物 百科说说说
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