You know a bird is cool when you'll drive past a Gyrfalcon for it. Ivory Gull was in that category, but after spending a few hours blazing through 1500+ pics of it a retreat was in order back to a little industrial island on the Wisconsin side of the river where eBird had revealed a Gyrfalcon to be hanging out.
The Ivory Gull made us wait 90 seconds; this bird was herding a flock of pigeons as we drove up before it settled back atop a grain (?) elevator.
Its wingbeats cut fairly deep as it accelerated.
I'm not sure what it flew out after initially but it essentially made a beeline right for us, looking down at us as it approached, revealing pale flight feathers with contrasting wing linings.
If you want to see a crazy good pic of this bird, this eBird checklist will elicit praise/envy. In looking for that link I see that there's since been a pic and a video posted of an adult gray morph on this checklist from about a quarter mile away from where our bird was.