这种黑嘴天鹅是北美品种，受到外来的疣鼻天鹅竞争，曾濒临灭绝，后来在保护人士努力下数量又有几万只了，它们都有登记

来源: 酒仙桥2 于 2025-03-20 17:45:33 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.