They're the two I meant - I always get whooper and trumpeter mixed up, I know which is which if I stop and think but when typing quickly at midnight then I'm easily confused
They're the two I meant - I always get whooper and trumpeter mixed up, I know which is which if I stop and think but when typing quickly at midnight then I'm easily confused
Worse than that, the name 'Tundra Swan' technically includes the mostly-black-billed Whistling Swan and the also heavily-yellowed (sub)species Bewick's Swan* - so you really mean Whistling or Trumpeter.
Trumpeters have all-black bills, 'blockier-shaped' black on the face and are generally stockier - this looks like a Trumpeter to me.
Whistling are more slender and delicate and usually have a yellow spot of varying size in front of the eye. On Blackbrook's birds the spot is small, but it is there: http://www.zoochat.com/192/whistling-swan-blackbrook-21-10-12-a-295112/ (you may need to view full-size image to see the yellow)
*and the taxonomically-dubious Jankowski's Swan, another yellow-billed form, which Blackbrook also displays
