這種黑嘴天鵝是北美品種，受到外來的疣鼻天鵝競爭，曾瀕臨滅絕，後來在保護人士努力下數量又有幾萬隻了，它們都有登記

來源: 酒仙橋2 於 2025-03-20 17:45:33 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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