the fine, soft under-feathers of a swan, or material used for items like powder puffs

lit. the toad wants to eat swan meat; to strive for something far beyond one's reach, social status, or capability, often used to mock unrealistic romantic or social aspirations

(bird species of China) tundra swan (Cygnus columbianus)

(bird species of China) whooper swan (Cygnus cygnus)

the Cygnus constellation

(bird species of China) mute swan (Cygnus olor)