St. Louis area. RMBS pics.
Here a Ring-billed with a small thin bill.
head tilted away shows under side of bill feathering. long wings
thin bill. eye centered
Here the 1st cycle Great B-b. Flight shows striking structure (jizz):
Note the low hung mid-body where girth is widest:
Here a Herring. Note the flattening of the mid-body:
GBB again.  The wings set farther back, more body forward and the slow wing-beat
(+coloring) gives the eagle effect:
Monday's pics: 
centered wings:
mid-body girth:
Bill Rudden
St. Louis
The Audubon Society of Missouri's Wild Bird Discussion Forum
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