Ran across this immature Trumpeter Swan yesterday. I have never seen one with a pure Orange Bill before. Maybe just a color variation. Talked to a local biologists who has seen this same bird. She is still looking into it. Any ideas????
actually, I think it is pretty cool and I dont think it is any hybrid, but ya never know?...
I have seen a few HY swans this year with more reddish bill than a typical HY bird but nothing as complete as your picture...
I would guess an Juvie Mute swan. Any White swan with an Orange Culmen in the wild here in Oregon is fair game according to F&W. They are trying to eliminate all the Mute swans that have gotten loose. We were told they are a huge threat to native waterfowl and that they need to be controlled.
The bill profile definitely does not look like a trumpeter and doesn't scream Tundra to me (but the camera angle could be the cause). Tundra cygnets can have almost entire pink bills.
But it also looks odd for a mute because there is no black on the bill and only a hint that a knob may be coming. Nevertheless I think it is a mute. Here is what the Trumpeter Swan Society picture of a mute juvey.
Likewise the British Trust for Ornithology photo of a mute cygnet.