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. Swans usually mate for life, though "divorce" does sometimes occur, particularly following nesting failure. The number of eggs in each clutch ranges from three to eight.
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. Swans usually mate for life, though "divorce" does sometimes occur, particularly following nesting failure. The number of eggs in each clutch ranges from three to eight.
天鵝屬在生物分類學上是雁形目（也包括鵝和鴨科）中的鴨科中的一個屬。這一屬的鳥類是遊禽中體形最大的種類，被俗稱為“天鵝”。有時它們被當作一個比較獨特的分支來研究。天鵝一般一生中都是配偶而居，有時候如果沒有找到自己的巢穴，它們也會|離婚|另尋配偶。一般一次一窩能生3到8個蛋。