Waders. 
Here ID HY (hatch year) white waders w/o size reference:

Here a Snowy with a dark-tipped bill:

Here a Little Blue eating a Western Lesser Siren:

Fillers.  
Apex Egret:
Note all the Horse hair showing on this Chipping Sparrow nest:
Hooded Crow like:
Pair of Kestrels:
Male snatching a dragonfly:

LBIMO
Bill Rudden
St. Louis
1. Great Egret (head looks like a large Cattle Egret)
2. Little Blue

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The Audubon Society of Missouri's Wild Bird Discussion Forum
List archives: https://po.missouri.edu/archives/mobirds-l.html