Swans are birds of the family Anatidae within the genus Cygnus.[3] The swans' closest relatives include the geese and ducks. Swans are grouped with the closely related geese in the subfamily Anserinae
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- 大图:3667 × 2443 像素·31.05 cm × 20.68 cm·300dpi·JPG
- 中图:1000 × 666 像素·35.28 cm × 23.5 cm·72dpi·JPG
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