A member of the family Cygnidae, which includes all swans and swan-like waterfowl.
From Latin 'cygnus' (swan) + '-id' (family member suffix). This zoological term became standard in the 19th century for classifying swan species.
All swans around the world belong to the Cygnidae family—so whether it's a mute swan in Europe or a black swan in Australia, they're all cygnids sharing ancient evolutionary cousins!
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