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There is a report of Mute X Trumpeter in British Columbia in 2007. It’s an anthropomorphized account—not scientifically-based.

> On Aug 10, 2019, at 17:46 PM, David Rogles <[log in to unmask]> wrote:
> 
> Mobirders,
> Tom and I need some help with a birding problem.
> 
> Today we found a bird, swan for sure, Trumpeter in the head, bill and body.  The tail was long and wide (from the back; resembled a MUSW from the side profile).
> We agree on all the details. 
> We know nothing of hybrid swans, and particularly of a MUSWxTRUS cross.
> Any information would be appreciated. 
> Bird was a full adult.  Not a TUSW cross. 
> 
> Thanks
> Dave and Tom
> St. Louis Co.
> 
> ------------------------------------------------------------
> The Audubon Society of Missouri's Wild Bird Discussion Forum
> List archives: https://po.missouri.edu/archives/mobirds-l.html
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Lisa Berger
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------------------------------------------------------------
The Audubon Society of Missouri's Wild Bird Discussion Forum
List archives: https://po.missouri.edu/archives/mobirds-l.html
ABA Birding Code of Ethics
http://www.aba.org/about/ethics.html