In juvenile swans, black legs = tundra, yellow/green legs = trumpeter. I see 
black, so yes for Tundra. 

Nick Komar
Fort Collins CO

> On Jan 2, 2019, at 1:44 PM, Ben S <[email protected]> wrote:
> 
> Hi all - 
> Found a swan swimming in the South Platte River about 1/4 of a mile south of 
> mineral bridge at South Platte Park about two hours ago. It was swimming 
> around, and briefly walked along the shore, but began swimming south. It was 
> clearly either an immature Trumpeter or Tundra Swan. I am leaning towards 
> Tundra because of modest size (not too much bigger than a Canada Goose) and 
> bill shape. Other birds of note was every regular CO species of diver at the 
> SW end of South Platte Reservoir (the rest was frozen), including 5 
> Canvasback and 14 Greater Scaup; as well as the continueing Black Scoter. 
> Other birds of note were a Prairie Falcon at south platte reservoir, a male 
> Northern Pintail on the river, a Hairy Woodpecker (heard only), Northern 
> Shrike, American Pipit (heard), and the continueing American Dipper (heard 
> only) near the Mineral Bridge. I am fairly sure the swan is a Tundra Swan, 
> but I will add these pictures so hopefully someone can confirm or refute 
> this: 
> 
> <IMG_7376 - Edited.jpg>
> 
> 
> 
> <IMG_7380 - Edited.jpg>
> 
> 
> 
> And, here is a link to my ebird checklist for more photos/details of the swan 
> and other birds:
> 
> 
> 
> https://ebird.org/view/checklist/S51223740 (South Platte Reservoir) 
> 
> 
> 
> https://ebird.org/view/checklist/S51223859 (South Platte Park -- C470 area) 
> -- swan pics 
> 
> https://ebird.org/view/checklist/S51223923 (SOuth Platte Park)
> 
> Ben Sampson, 
> Centennial, CO 
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> <IMG_7376 - Edited.jpg>
> <IMG_7380 - Edited.jpg>

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