Bird of the day ...

 might have been this boot.  While it is on the banks of the Mississippi River, it's not an Ivory Gull

 
This is also not an Ivory Gull though it has a white head.



These birds could be Ivory Gulls.  They're all white.

However they can't #$%^# fly, so by definition they can't be Ivory Gulls.  The Ivory Gull flew away.  Two &%%^@ days ago.

I guess we were close to St Louis, because similar to Ivory Gulls, these didn't use to regularly grace the banks of the beautiful Mississippi River.