Swans are a rare kind of bird in the animal kingdom.
They're hardly the biggest ones on the block, of course. If we're talking about known, non-extinct species, that title would go to the ostrich, with the emu coming in second.
Nor are swans the most unique-looking winged creatures to be found. Peacocks easily beat them out in that department. So do toucans and probably parrots, in my opinion.
For that matter, I'm sure there are plenty of other more attention-grabbing examples out there among the 10,000-plus known species of birds and 21,000 subspecies that