For those who have the 'big Sibley's, page 23 shows all the loons  
side-by-side, and in non-breeding plumage.
In a message dated 11/7/2007 9:36:38 A.M. Eastern Standard Time,  
[log in to unmask] writes:

Echoing  Gregory Askew's observation that there has not been much discussion 
of the  field marks of this bird, would any of the birders who have seen this 
bird be  willing to fill in the blanks? What are the distinguishing field 
marks on this  bird?

Good  Birding!

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