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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. 

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