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发表于 2019-4-23 13:39:43 | 显示全部楼层 |阅读模式
Swans are birds of the family Anatidae, which also includes geese and ducks.

Swans are grouped with the closely related geese in the subfamily Anserinae where they form the tribe Cygnini.


Sometimes, they are considered a distinct subfamily, Cygninae. 奉化招聘号


Swans usually mate for life, though 'divorce' does sometimes occur, particularly following nesting failure. 长兴招聘号


The number of eggs in each clutch ranges from three to eight.





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