Folks,
I had made a composite pic of the Boyd Swan(s) and the Walden Swan to see if
I could illustrate the difference between Tundra and Trumpeter. That
exercise made me start to question the ID of the Boyd swans. We noticed
dark legs at the time we viewed the birds but suspected light / mud was in
effect, but we were hung up on the bill size / shape. I agree with Steve's
assessment the Boyd birds are juvenile Tundras and not Trumpeters. In
addition to what has already been said regarding leg, body color and molt
timing, the eye is distinctly broader than the dark lore connecting the
bill. This isolates the eye from the bill and is noticeable. I have now
made a composite of the Boyd swans and a photo of an adult Trumpeter my
friend took recently in Wyoming. The isolated eye feature is apparent. I
have found this to be fairly reliable no matter the age of the birds.
http://www.pbase.com/image/154674105
Glenn Walbek
Castle Rock, CO
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