El Paso swan ID question

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I think these pictures show a Trumpeter swan based on its bill shape and color which is what Bill Maynard and Brandon Percival originally thought they saw (and later questioned) at Rice's pond at Fountain Creek Nature center on Tuesday.

 

  Comments on this swan's ID are welcome, is it a Trumpeter or Tundra swan?

 

http://www.avoapples.com/birds/IMG_2497_cr.jpg

 

http://www.avoapples.com/birds/IMG_2513_cr.jpg

 

Thanks!

 

Bill Kosar

Colorado Springs

bill_...@msn.com

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Here are some more pictures showing frontal views:

 

http://www.avoapples.com/birds/IMG_2491_cr.jpg

http://www.avoapples.com/birds/IMG_2490_cr.jpg

http://www.avoapples.com/birds/IMG_2516_cr.jpg

http://www.avoapples.com/birds/IMG_2530_cr.jpg

http://www.avoapples.com/birds/IMG_2534_cr.jpg

 

Thanks for the comments so far

 

Bill

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After much staring at pictures and various guides people have pointed me to I think this is actually a Tundra swan for these reasons:

 

1, Sharp prominent curves in bill around gape

2. In all of my pictures there is evidence of the yellow teardrop marking on the lore. It looks like a reflection at first but it is in the same location at different angles and has some degree of yellow in it.

3. The area of the bill where it joins the eye is relatively narrow

4. The shape of the back is not as evenly rounded as the tundra

 

Thanks for all of the comments.