St. Charles county MO.  Madison county (the wall) IL.
Here a pale 1st cycle Thayer's type atop the wall:
It's on the large end if it's a Thayer's:
Here maybe the same gull from the spillway:
Here another 1st cycle large gull
with a dark-tipped bill and long wing projection:
A 3rd cycle Herring, muddy greater coverts; black on tertial crescent:
and of course the pied tail:
Here a adult Thayer's on the wall with a short P10: (I think)
Here another adult Thayer's on the wall Sat.:
 Looks a shade darker, accenting the tertial crescent:
Our wintering 1st cycle Glaucous:
Bill Rudden
St. Louis
The Audubon Society of Missouri's Wild Bird Discussion Forum
ASM Website: